The Castelli Free Donna Tri Top offers you a lightweight, quick drying, top that will keep you comfortable and fast through every stage of the race. The Free Donna Tri Top uses Instadry Speed, which is a sleek, stretch polyester that offers excellent muscle support. The fabric also features a hydrophobic treatment to ensure that you're fast in the water. The fabric also dries rapidly, making the transition to the next stage effortless. Castelli uses Velocity mesh at the back for improved ventilation, and the full length zipper lets you dump heat on the fly. The top also has two rear pockets that will easily stow your race day essentials. And to ensure you stay fast, Castelli covers the pockets with flaring flaps to reduce drag.