The FUTURUM 4 SEASONS Helmet Hat Merino is an ideal accessory to wear under your helmet. The helmet hat is made of 95% high-quality merino wool. This makes that you can enjoy great comfort thanks to the fine structure of this wool. In cold conditions it keeps your head nice and warm, but in warm conditions heat and moisture are quickly removed due to the high breathability. The helmet hat fits perfectly under your helmet and due to the flat-stitched seams it won't cause skin irritation.