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Boys' activewear tops are ideal for the busy little men in your life. You'll never pay retail for these hard-wearing apparel items again when you shop at thredUP.
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![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/598374066/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/598373977/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$18.99 $10.44 45% off with code GOBIG
53% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/598408050/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/598407309/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$20.99 $11.54 45% off with code GOBIG
48% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/598403184/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/598403047/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/597943505/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/597943322/complimentary.jpg)
Under Armour
Active T-Shirt
Size Large youth
$18.99 $10.44 45% off with code GOBIG
53% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/598424465/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/598424334/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/597093840/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/597093777/complimentary.jpg)
Under Armour
Active T-Shirt
Size X-Large youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/596710057/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/596710026/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$18.99 $10.44 45% off with code GOBIG
53% off estimated retail![FLOW SOCIETY Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/488390800/complimentary.jpg)
![FLOW SOCIETY Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/488390742/complimentary.jpg)
FLOW SOCIETY
Active T-Shirt
Size X-Small youth
$9.99 $5.49 45% off with code GOBIG
58% off estimated retail![Athletic Works Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/596632897/complimentary.jpg)
![Athletic Works Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/596632851/complimentary.jpg)
Athletic Works
Active T-Shirt
Size X-Small kids
$7.99 $4.39 45% off with code GOBIG
42% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/598121586/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/598121440/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$8.99 $4.94 45% off with code GOBIG
78% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/598107262/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/598107113/complimentary.jpg)
Under Armour
Active T-Shirt
Size Large youth
$15.99 $8.79 45% off with code GOBIG
61% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/596638282/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/596638145/complimentary.jpg)
Under Armour
Active T-Shirt
Size Large youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595977407/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595977335/complimentary.jpg)
Under Armour
Active T-Shirt
Size Large youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/597760418/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/597760290/complimentary.jpg)
Under Armour
Active T-Shirt
Size X-Large youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/597807903/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/597807819/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/597451815/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/597451767/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/597273392/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/597273249/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/596969100/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/596969045/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small kids
$14.99 $8.24 45% off with code GOBIG
55% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/596435404/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/596434763/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595750725/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595750475/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595929544/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595929489/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595845231/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595845150/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595926210/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595926114/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595929321/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595929203/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595417081/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595417023/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$18.99 $10.44 45% off with code GOBIG
53% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595520849/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595520744/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$21.99 $12.09 45% off with code GOBIG
46% off estimated retail![Polar Quality Sportswear Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595894118/complimentary.jpg)
![Polar Quality Sportswear Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595893807/complimentary.jpg)
Polar Quality Sportswear
Active T-Shirt
Size 10
$10.99 $6.04 45% off with code GOBIG
31% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595127549/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595127521/complimentary.jpg)
Under Armour
Active T-Shirt
Size Large youth
$15.99 $8.79 45% off with code GOBIG
61% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595298130/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595298075/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$11.99 $6.59 45% off with code GOBIG
70% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595341989/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595341802/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$17.99 $9.89 45% off with code GOBIG
56% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/611675556/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/611675552/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$18.99 $10.44 45% off with code GOBIG
53% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/594422252/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/594421982/complimentary.jpg)
Under Armour
Active T-Shirt
Size X-Large youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/594421627/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/594421420/complimentary.jpg)
Under Armour
Active T-Shirt
Size X-Large youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/594496637/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/594496595/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$18.99 $10.44 45% off with code GOBIG
53% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/594428930/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/594428832/complimentary.jpg)
Under Armour
Active T-Shirt
Size X-Large youth
$18.99 $10.44 45% off with code GOBIG
53% off estimated retail![FLOW SOCIETY Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/488377413/complimentary.jpg)
![FLOW SOCIETY Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/488377190/complimentary.jpg)
FLOW SOCIETY
Active T-Shirt
Size X-Small youth
$8.99 $4.94 45% off with code GOBIG
62% off estimated retail![FLOW SOCIETY Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/488381606/complimentary.jpg)
![FLOW SOCIETY Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/488381420/complimentary.jpg)
FLOW SOCIETY
Active T-Shirt
Size X-Small youth
$8.99 $4.94 45% off with code GOBIG
62% off estimated retail![Zyia Active Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/595010577/complimentary.jpg)
![Zyia Active Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/595010529/complimentary.jpg)
Zyia Active
Active T-Shirt
Size Large youth
$16.99 $9.34 45% off with code GOBIG
65% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/594023573/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/594023492/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$21.99 $12.09 45% off with code GOBIG
46% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/593811646/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/593811593/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/593682437/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/593682381/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$17.99 $9.89 45% off with code GOBIG
56% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/594080052/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/594079943/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/593614953/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/593614826/complimentary.jpg)
Under Armour
Active T-Shirt
Size Medium youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/593488919/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/593488888/complimentary.jpg)
Under Armour
Active T-Shirt
Size X-Small youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Athletic DNA Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/593677270/complimentary.jpg)
![Athletic DNA Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/593677124/complimentary.jpg)
Athletic DNA
Active T-Shirt
Size Small youth
$12.99 $7.14 45% off with code GOBIG
48% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/592957700/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/592957655/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$11.99 $6.59 45% off with code GOBIG
55% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/592819143/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/592819106/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$15.99 $8.79 45% off with code GOBIG
61% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/593294157/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/593293971/complimentary.jpg)
Under Armour
Active T-Shirt
Size Large youth
$21.99 $12.09 45% off with code GOBIG
46% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/592621024/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/592620963/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$11.99 $6.59 45% off with code GOBIG
55% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/592623135/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/592623060/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$16.99 $9.34 45% off with code GOBIG
58% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/592644984/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/592644767/complimentary.jpg)
Under Armour
Active T-Shirt
Size Large youth
$21.99 $12.09 45% off with code GOBIG
46% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/592512910/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/592512959/complimentary.jpg)
Under Armour
Active T-Shirt
Size X-Large youth
$22.99 $12.64 45% off with code GOBIG
43% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/592017974/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/592018015/complimentary.jpg)
Under Armour
Active T-Shirt
Size X-Small youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/592541294/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/592541284/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/591579090/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/591579027/complimentary.jpg)
Under Armour
Active T-Shirt
Size Large youth
$20.99 $11.54 45% off with code GOBIG
48% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/593360990/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/593360861/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$25.99 $14.29 45% off with code GOBIG
61% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/531062939/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/531062868/complimentary.jpg)
Under Armour
Active T-Shirt
Size X-Small youth
$18.99 $10.44 45% off with code GOBIG
53% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/592388878/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/592388855/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$19.99 $10.99 45% off with code GOBIG
51% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/592231592/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/592231532/complimentary.jpg)
Under Armour
Active T-Shirt
Size Small youth
$17.99 $9.89 45% off with code GOBIG
56% off estimated retail![Under Armour Active T-Shirt (view 2)](https://cf-assets-thredup.thredup.com/assets/589870520/complimentary.jpg)
![Under Armour Active T-Shirt (view 1)](https://cf-assets-thredup.thredup.com/assets/589870406/complimentary.jpg)
Under Armour
Active T-Shirt
Size X-Small youth
$13.99 $7.69 45% off with code GOBIG
30% off estimated retail