Pearl Izumi - Run Men's Pro in-R-Cool Tri Singlet 82% Polyester, 18% Elastane, Upf 50+ Imported 82% polyester 18% elastane Imported product 2015 Spring/Summer P.R.O. Transfer Aero with In-R-Cool fabric powered by coldblack provides aerodynamic benefits and optimal cooling with reflective sun protection Single-layer stitch free armhole and neck for superior next-to-skin comfort. Two back streamlined easy access envelope pockets