True to Size: Purchase your normal size to wear under other layers. Maximum insulation for warmth in extreme conditions + Moisture resistant DWR exterior repels snow/rain. Dead quiet even in sub freezing temperatures. Stays warm whether dry or wet. Exclusive 37.5 fabric uses Active Carbon Technology moving perspiration (human signature) to the outside of the garment where it is functionally neutralized. Built-in stretch for complete range of motion. Constructed with biomechanically accurate Shooter's sleeves, shoulders and hood. Available in men's sizes: SM, MD, LG, XL, XXL. Covered by First Lite's Warranty. ASAT Finish