whatismysize.com

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

SizeUSEUUKWaist (cm)Hips (cm)
SS (28-30)3S71-7686-91
MM (32-34)4M81-8696-101
LL (36-38)5L91-97104-109
XLXL (40-42)6XL102-107112-117
XXLXXL (44-46)7XXL112-117119-124

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

Frequently Asked Questions

We use analytics cookies to improve this tool. Learn more