Pearl's Women's P.R.O. Tri Singlet is made of Pearl's chlorine-resistant P.R.O. Aero fabric with their In-R-Cool technology that provides optimal skin cooling and moisture management when you perspire. This jersey is ultra thin so there's no bulk to slow you down, and there's an integrated bra top for support. You also get Pearl's Direct-Vent mesh panels for temperature regulation and breathability on even the hottest days, flat-lock seams and low-profile hems for streamlining and comfort and 2 rear pockets.