Castelli T1 Stealth Top
We’ve all seen the world’s top time trial riders using their long sleeve shirts for increased aerodynamics – the idea is that some materials will cut through the wind much faster than your own skin. Castelli has now come up with a jersey you can wear in a triathlon to replicate that effect. According to Castelli’s research, the T1 top will save you over three minutes over the course of an Ironman bike ride. The long-sleeve shirt reduces aerodynamic drag and offers protection from the sun. The sleeves even change colour when they get hot, providing a visual reminder to douse your arms with water.