Lightweight button up fishing style shirt with Solar-Factor UPF 40+ UV Protection, sweat activated cooling, quick dry, stain release, and added spandex for increased range of motion. Cationic Stretch Woven Polyester/Spandex Core Breathable Knit with Geo Technologies at Under Arm and Back Solar-Factor 50+ UPF Wicking, Sweat Activated Cooling, Quick Dry and Stain Release Cape Back with Mesh Venting Dual Zipper Pocket Sunglass Loop and Cleaner Specs Body: 96% Polyester, 4% Spandex Accent: 100% Polyester 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 5'10" and 195lbs. He is wearing size Large. Fits true to size.