O'Neill UV Sun Protection Men's Skins Long Sleeve Crew Rashguard 91% nylon 6oz. Nylon/Spandex 4-Way Stretch Long Sleeve 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.^Board short Connector