Castelli Free Donna Womens Tri Top Hydrophobic treatment is fast in the swim & doesn&8217;t absorb water. Velocity mesh back gives wind tunnel proven speed on the bike. Micro clip hooks keep top locked down during swim & bike legs. YKK&174; Camlock front zipper. GIRO3 arm & back elastic. Chafe-free underarm construction. Buy Castelli Free Donna Womens Tri Top from Chain Reaction Cycles, the worlds largest online bicycle store