Warm yet lightweight, the Silkbody Caterpillar Hat is a great beanie to have handy in your pocket or bag for those colder days. The 100% natural Silkspun blend means the fabric is breathable and assists your body to regulate temperature easily, keeping you warm but not overheated. Perfect underneath helmets - biking, skiing, or climbing - or heavy duty cold weather hats to give you that extra layer of protection and comfort.