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Dive into a huge selection of Under Armour at thredUP, where you can find durable, high-quality boys' clothing for play and school that stand up to the hard knocks of childhood. Think secondhand first and shop like-new hoodies and athletics at 90% off estimated retail prices.

Under ArmourRemove filterIvoryRemove filter
27 items
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    Under Armour Short Sleeve Polo (view 2)Under Armour Short Sleeve Polo (view 1)
    View Product: Under Armour Short Sleeve Polo

    Under Armour

    Short Sleeve Polo
    Size 6
    $19.99
    51% off estimated retail
    Under Armour Short Sleeve Polo (view 2)Under Armour Short Sleeve Polo (view 1)
    View Product: Under Armour Short Sleeve Polo

    Under Armour

    Short Sleeve Polo
    Size Small youth
    $19.99
    51% off estimated retail
    Under Armour Shorts (view 2)Under Armour Shorts (view 1)
    View Product: Under Armour Shorts

    Under Armour

    Shorts
    Size X-Small youth
    $12.99
    51% off estimated retail
    Under Armour Short Sleeve T-Shirt (view 2)Under Armour Short Sleeve T-Shirt (view 1)
    View Product: Under Armour Short Sleeve T-Shirt

    Under Armour

    Short Sleeve T-Shirt
    Size X-Large youth
    $11.99
    55% off estimated retail
    The Edit. Forever Classic, Get perfectly polished in trousers, blazers, and more. Shop The Edit
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)Flawed Gem
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Large youth
    $15.99
    61% off estimated retail
    Under Armour Pullover Hoodie (view 2)Under Armour Pullover Hoodie (view 1)
    View Product: Under Armour Pullover Hoodie

    Under Armour

    Pullover Hoodie
    Size X-Large youth
    $21.99 $15.39 30% off with code THANKU
    60% off estimated retail
    Under Armour Short Sleeve Polo (view 2)Under Armour Short Sleeve Polo (view 1)Flawed Gem
    View Product: Under Armour Short Sleeve Polo

    Under Armour

    Short Sleeve Polo
    Size 5
    $11.99 $9.59 20% off with code THANKU
    47% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Large youth
    $16.99 $11.89 30% off with code THANKU
    58% off estimated retail
    Under Armour Short Sleeve T-Shirt (view 2)Under Armour Short Sleeve T-Shirt (view 1)
    View Product: Under Armour Short Sleeve T-Shirt

    Under Armour

    Short Sleeve T-Shirt
    Size Medium youth
    $10.99 $8.79 20% off with code THANKU
    59% off estimated retail
    Under Armour Short Sleeve Polo (view 2)Under Armour Short Sleeve Polo (view 1)
    View Product: Under Armour Short Sleeve Polo

    Under Armour

    Short Sleeve Polo
    Size Large youth
    $20.99 $15.74 25% off with code THANKU
    48% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size X-Large youth
    $16.99 $12.74 25% off with code THANKU
    58% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Large kids
    $17.99 $13.49 25% off with code THANKU
    56% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size X-Large youth
    $9.99 $7.99 20% off with code THANKU
    75% off estimated retail
    Under Armour Short Sleeve T-Shirt (view 2)Under Armour Short Sleeve T-Shirt (view 1)Flawed Gem
    View Product: Under Armour Short Sleeve T-Shirt

    Under Armour

    Short Sleeve T-Shirt
    Size Small youth
    $9.99 $7.99 20% off with code THANKU
    56% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Small kids
    $17.99 $12.59 30% off with code THANKU
    47% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size X-Small youth
    $16.99 $12.74 25% off with code THANKU
    58% off estimated retail
    Under Armour Tank Top (view 2)Under Armour Tank Top (view 1)
    View Product: Under Armour Tank Top

    Under Armour

    Tank Top
    Size Medium youth
    $12.99 $9.09 30% off with code THANKU
    51% off estimated retail
    Under Armour Short Sleeve T-Shirt (view 2)Under Armour Short Sleeve T-Shirt (view 1)
    View Product: Under Armour Short Sleeve T-Shirt

    Under Armour

    Short Sleeve T-Shirt
    Size X-Large kids
    $11.99 $8.99 25% off with code THANKU
    55% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)Price Drop
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Small infants
    $12.99 $9.74 25% off with code THANKU
    51% off estimated retail
    Under Armour Short Sleeve Onesie (view 2)Under Armour Short Sleeve Onesie (view 1)
    View Product: Under Armour Short Sleeve Onesie

    Under Armour

    Short Sleeve Onesie
    Size 18 mo
    $9.99 $7.49 25% off with code THANKU
    44% off estimated retail
    Under Armour Short Sleeve Polo (view 2)Under Armour Short Sleeve Polo (view 1)Price Drop
    View Product: Under Armour Short Sleeve Polo

    Under Armour

    Short Sleeve Polo
    Size X-Small youth
    $19.99 $12.99 35% off with code THANKU
    51% off estimated retail
    Under Armour Short Sleeve Onesie (view 2)Under Armour Short Sleeve Onesie (view 1)Price Drop
    View Product: Under Armour Short Sleeve Onesie

    Under Armour

    Short Sleeve Onesie
    Size 3-6 mo
    $10.99 $8.79 20% off with code THANKU
    38% off estimated retail
    Under Armour Short Sleeve T-Shirt (view 2)Under Armour Short Sleeve T-Shirt (view 1)Price Drop
    View Product: Under Armour Short Sleeve T-Shirt

    Under Armour

    Short Sleeve T-Shirt
    Size X-Large youth
    $12.99 $9.74 25% off with code THANKU
    51% off estimated retail
    Under Armour Short Sleeve Onesie (view 2)Under Armour Short Sleeve Onesie (view 1)Price Drop
    View Product: Under Armour Short Sleeve Onesie

    Under Armour

    Short Sleeve Onesie
    Size 3-6 mo
    $10.99 $8.79 20% off with code THANKU
    38% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)Price Drop
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Small youth
    $13.99 $9.79 30% off with code THANKU
    65% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)Price Drop
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Medium youth
    $9.99 $7.99 20% off with code THANKU
    75% off estimated retail
    Under Armour Active T-Shirt (view 2)Under Armour Active T-Shirt (view 1)Price Drop
    View Product: Under Armour Active T-Shirt

    Under Armour

    Active T-Shirt
    Size Small youth
    $9.99 $7.99 20% off with code THANKU
    75% off estimated retail
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