Castelli Size Chart The Sfida Jersey features Castelli's Nido d'Ape thermal fabric that provides extra warmth and comfort. This jersey is designed for fall and spring conditions, with features that will make this the first thermal jersey you grab from the closet. The extra-high collar has Zen construction to protect the neck, while the Vislon(R) zipper is the easiest-sliding zipper available, and it's helped by Castelli's scorpion pull that's easy to find even when wearing gloves. Features: - Nido d'Ape 3D thermal fabric on main body and under sleeves - Warmer fabric on shoulders and front of sleeves - Cross-wrap flat wrist openings - YKK(R) Vislon(R) zipper with scorpion pull - Zen collar to protect neck from top of zipper - 3 rear pockets with perforated reflective band for extra visibility - Weight: 329g