Castelli's Core Tri Shorts are designed to power through race after race all season long. The Core Tri Short is made with Pace 3 material, which supports your muscles with a gentle compression, and offers you a fast drying, aerodynamic fit. The shorts are equipped with speed hooks that allow you to link the back of the shorts to a compatible jersey while still maintaining an ideal fit. Castelli includes the Kiss Tri insert, which provides ample support with a sleek, flexible design that delivers optimal performance during the swim and run stages. And if you need additional storage space, the Core shorts features a rear envelope pocket. Finally, the lie flat elastic bands keep your shorts in place without any additional drag.