Pearl Izumi's P.R.O. In-R-Cool Tri Singlet is constructed with lightweight, aerodynamic and friction-reducing materials to help you slice through the competition. Pearl's P.R.O. Transfer Aero fabric provides UPF 50+ sun protection and features In-R-Cool technology to reflect the sun's rays and keep you at your best. This form-fitting top is ultra thin so there's no bulk to slow you down, and Pearl's Direct-Vent mesh panels offer temperature regulation and breathability on even the hottest days. Plus, you get overlock stitch construction and low-profile hems for a streamlined fit, a pair of rear pockets and a handy laundry bag, too.