O'Neill Wetsuits Mens O'Zone Comp Long Sleeve Crew Sun Shirt 7oz high power polyester for flexibility; U.P.F. 40+ Compersssion Fit in key areas improves muscle performance, strength, and recovery TechnoButter Skins fabric in key secondary areas for breathability and comfort Reduced muscle vibration = reduced fatigue= shorter recovery time Water resistant finish reduces water absorbtion and dry time; board short connector