Castelli Pro Thermal 3 Skully Cap Description: The Castelli Pro Thermal 3 Skully Cap is made for warmth with excellent wicking while minimizing bulk under your helmet. This simple helmet liner has a raw-cut edge so it doesn't interfere with the straps or helmet cage, while the Thermoflex fabric is surprisingly warm and wicks away moisture. Features: Thermoflex is warm, soft, and stretchy Flat-lock stitching Contoured to cover ears Raw-cut edge lies flat and doesn't bunch under helmet Reflective detailing on back Specifications: Season: Cool Weather Application: - Material: Synthetic Visibility: Reflective Color: Blue