Under Armour Underwear Size Chart
Under Armour runs true to size.
Runs SmallTrue to SizeRuns Large
Under Armour Men's Underwear Size Chart
Enter your waist or hip measurement to see your size highlighted here.
| Size | US | EU | UK | Waist (cm) | Hips (cm) |
|---|---|---|---|---|---|
| SM | SM (28-29) | 3 | SM | 71-74 | 86-91 |
| MD | MD (30-32) | 4 | MD | 76-81 | 91-99 |
| LG | LG (34-36) | 5 | LG | 86-91 | 99-107 |
| XL | XL (38-40) | 6 | XL | 97-102 | 107-117 |
| 2XL | 2XL (42-44) | 7 | 2XL | 107-112 | 117-127 |
Under Armour Women's Underwear Size Chart
Enter your waist or hip measurement to see your size highlighted here.
| Size | US | EU | UK | Waist (cm) | Hips (cm) |
|---|---|---|---|---|---|
| XS | XS (0-2) | 34 | 6 | 58-63 | 84-89 |
| S | S (4-6) | 36 | 8-10 | 64-69 | 89-94 |
| M | M (8-10) | 38-40 | 12-14 | 69-76 | 94-102 |
| L | L (12-14) | 42-44 | 16-18 | 76-84 | 102-109 |
| XL | XL (16-18) | 46-48 | 20-22 | 84-94 | 109-117 |
| XXL | XXL (20-22) | 50-52 | 24-26 | 94-102 | 117-124 |
Data verified May 2026 · Official size guide · See an error? Report it
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.
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Frequently Asked Questions
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.
Measure your waist at the narrowest point (usually just above the belly button) and your hips at the widest point. Then use our size chart table above to find your Under Armour size.
If you're between sizes in Under Armour underwear, we recommend sizing up for a more comfortable fit. Underwear that's too tight can be uncomfortable throughout the day, while slightly loose underwear is usually fine.