Castelli's Men Core 2 Short is designed as the ideal companion for racing and training and ideal for runs or shorter-distance tri events. Castelli crafts the Core 2 from Pace 3 material helping support muscles with gentle compression while offering fast-drying properties and an aerodynamic fit. It's highly stretchable so the short is able to conform to your every move. Lie-flat GIRO3 elastic keeps the short firmly in place regardless of what discipline you currently find yourself in. Castelli forgoes any sort of padding or chamois preventing the absorption of water during the swim and reducing any kind of bulk that would interfere with the run. And since you probably don't have pockets on your singlet, you'll appreciate the Core shorts' rear envelope pocket giving a bit more room for easily-accessible food, letting you abstain from strapping an aerodynamically inefficient bento box to your top tube or tucking them into your leg bands.