The GAMMA RAY Is scientifically proven to make you look cool yet stay warm. It's a matter of fact. OR It's like Icy Hot for your wardrobe. • Half-zip with side seam pockets and ribbed sleeves • Lightweight, moisture-dispersing fabric • Wrinkle resistant and quick dry • Model: 6'2", 195 lb, shown wearing size M • 58% Cotton / 32% Polyester / 10% Lycra