WHAT IS IT / PRODUCT FEATURES Freedom of movement and comfort in the form of a classic sleeveless jersey Freedom of movement and comfort in the form of a classic sleeveless jerseyLight material for optimal cooling, breathability and comfortRear pockets follow the back and sports nutrition does not jump in them YKK® Camlock® zipperFlat elastic waistband fits the bottom backSnapLock fastening on the waist to fasten the jersey to the trousers so that it does not roll up while swimming or cycling. sleeves. It can be more comfortable when running and feel cooler with better freedom of movement. Most runners race in a singlet for these very reasons. The jersey has two pockets big enough for everything you need during a race or training. It has a SnapLock closure compatible with CASTELLI shorts to keep the jersey from riding up while swimming and to keep your lower back covered on the bike - then unzip the jersey for added comfort on the run. Thanks to the YKK zipper, ventilation is easier than ever. We have sewn the armholes with a soft fabric to prevent chafing and maintain the aerodynamics of the bike.