O'Neill UV Sun Protection Men's Hyperfreak Long Sleeve Crew Rashguard 88% polyester, 12% spandex; Inside panels: 100% nylon. 1.5mm 100% TechnoButter Neoprene - Long Sleeve Crew 50+ UV Protection Factor Performance Fit: Form fitting tight layer fits like a second skin Reversible, Unfinished Sleeve Cuffs Elastic Cinch System, Boardshort Connector Loop