Comfortable Performance Stretch Midweight Polyester Spandex mix with Scent-Factor and Moisture Wicking Technologies to keep you dry and warm while remaining undetected. Performance Stretch Midweight Polyester Spandex Scent-Factor Technology Moisture Wicking Technology Quarter Zip Design with Interior Storm Flap for Comfort ad Protection Comfortable Flatlock Seaming Pairs with Men's Buck Hill Base Layer Bottom Specs 92% Polyester; 8% Spandex Machine wash cold with like colors, Only non-chlorine bleach when needed, Tumble dry low, Remove promptly, Cool iron if needed Sizing and Fit Model is 5'7" and 185lbs. He is wearing size Large. Fits true to size.