Cold weather doesn't discriminate. Even if you have Rapunzel tresses, your head will get cold during your winter rides. A skull cap is a must-have, and the Viva Donna Skully is the one for you. Castelli constructed the Skully from its Thermoflex fabric. This material features a polished polyester finish on the outside and a lightly brushed soft fleece on the inside. Essentially, the soft interior traps warm air against the head, while the breathable outside allows moisture to escape and evaporate. This way, you're able to stay dry without running the risk of overheating. Additionally, the fabric was also left raw at the edges, meaning that it won't bunch under your helmet. Plus, it features a small trapdoor in the back to accommodate a ponytail. It's a small detail, but it adds up to a big deal when you have long tresses. The Castelli Viva Donna Skully is available in the color Black and in one size.