The Course Tri SS Jersey is designed for maximum aerodynamics. CB M-2 fabric at the sleeves is proven in wind-tunnel to improve aerodynamics on the bike as well as providing protection from sun. The full length zip allows maximum ventilation on the run while allowing athletes to put the jersey in T1 (transition from swim to bike) in non-wetsuit events. The one-piece CB Speedtech body ensures a minimal number of seams, eliminating friction points. Both fabrics are treated with coldblack® that allows the heat to be reflected and prevents overheating, and offer UPF/SPF 50 protection from the sun.