Boys' Athletic Clothes, Shoes & Gear - Short Sleeves or Shorts or Underwear | Under Armour

New Arrivals
- Men
- Women
- Kids
- Shoes
Featured
Gift Guide
Winter Sports

Featured
Shop by Category
- Baselayer
- Hoodies & Sweatshirts
- Jackets & Vests
  - Jackets
  - Vests
- Leggings
- Matching Sets
- Shirts & Tops
  - Crop Tops
  - Graphic T-shirts
  - Hoodies & Sweatshirts
  - Long Sleeves
  - Polo Shirts
  - Short Sleeves
  - Tank Tops & Sleeveless
- Shoes
- Shorts
- Sports Bras
- Sweatpants & Joggers
- Underwear
Shop by Sport
Shop by Collection
Accessories
- Backpacks & Bags
- Beanies & Cold Weather Gear
- Crossbody & Waist Bags
- Hats & Visors
- Headbands & Scrunchies
- Lunch Boxes
- Socks
- Sport Gloves
- Sunglasses
- Water Bottles & Coolers

Featured
- New Arrivals
- Tween Shop
- Hoodie SZN
- Gear That Keeps You Warm
- Extra 30% Off Outlet
Boys
Girls
Shop by Sport
- Hockey
- Baseball
- Basketball
- Flag Football
- Football
- Golf
- Hiking & Outdoor
- Softball
- Soccer
- Volleyball
Shop by Size
- Big Kids (8-20)
- Little Kids (4-7)
- Toddler (2T - 4T)
- Infant (12M - 24M)
- Newborn (0M - 9M)

Featured
- New Arrivals
- Release Calendar
- Curry Brand
- Shoes Under $100
- Extra 30% Off Outlet
Shop by Category
- Sandals & Slides
- Cleats
- Lifestyle Shoes
- Boots
- Wide Shoes
Shop by Gender
- Men's Shoes
- Women's Shoes
- Boys' Shoes
- Girls' Shoes
Shop by Sport
- Baseball
- Basketball
- Fishing
- Football
- Golf
- Hiking & Hunting
- Lacrosse
- Running
- Soccer
- Military & Tactical
- Track & Field
- Training
- Volleyball
Shop by Collection
- UA Charged+
- UA Halo
- UA SlipSpeed™
- Curry Brand
- D. Fox 2
- UA Phantom
- Project Rock
- Bryce Harper