Under Armour Underwear Size Chart
Under Armour underwear size chart for performance and athletic styles. Convert UA underwear sizes between US, EU, and UK systems.
Size Chart
Data verified Apr 2026 · Official size guide · See an error? Report it
| Size | US | EU | UK | Waist (cm) | Hips (cm) |
|---|---|---|---|---|---|
| S | S (28-30) | 3 | S | 71-76 | 86-91 |
| M | M (32-34) | 4 | M | 81-86 | 96-101 |
| L | L (36-38) | 5 | L | 91-97 | 104-109 |
| XL | XL (40-42) | 6 | XL | 102-107 | 112-117 |
| XXL | XXL (44-46) | 7 | XXL | 112-117 | 119-124 |
Under Armour Sizing & Fit Guide
Under Armour underwear is designed for athletic performance with a snug, supportive fit. Their Boxerjock line runs true to size but feels tighter than casual underwear. Tech Mesh is more breathable. Size up if transitioning from casual brands.
View Under Armour's official size guide