When it comes to surviving winter, a skully is one of those indispensable items every rider needs. Not only are they useful for cold training rides, they"re handy for keeping your head warm any time you step out the door. You"ll dig the Castelli Viva Thermo Skully because it says you"re a cyclist without looking too dorky off the bike. Cut from Castelli"s ultra-stretchy Thermoflex material, this cap has a polished polyester finish on the outside and a lightly brushed fleece inside to trap warm air around your head, giving you a snug but comfortable fit. The material is left raw-cut at the top and bottom to make the ends lie as flat as possible and to keep bulk at the absolute minimum. The Castelli Viva Thermo Skully is one size fits all and comes in three colors -- Black/red, Red/white, and White/red.