Pearl's P.R.O. Tri Singlet is constructed with lightweight, aerodynamic and friction-reducing materials to get you to the finish in record time. The P.R.O. Featherweight Gloss fabric provides UPF 50 protection, it's chlorine-resistant and it's ultra thin so there's no bulk to slow you down. Direct-Vent mesh panels give you unsurpassed temp regulation and breathability on even the hottest days. Flat-lock seams and low-profile hems give you a streamlined, comfortable fit and a rear pocket lets you stash some nutrition for out on the course.