O'Neill UV Sun Protection Men's Basic Skins Long Sleeve Crew Rashguard polyester,spandex 6oz. Polyester/Spandex Rashguard Crew - Quick Dry, 4-way stretch^50+ UV Protection Factor^Performance Fit: Form fitting tight layer fits like a second skin^Flatloc Stitched - To avoid skin irritation.^Strategic Seamless Paddle Zones