Castelli’s Pro Thermal 2 Skully is a lightweight, low-profile winter essential designed to fit perfectly under a helmet. Made with warm and stretchy Thermoflex fabric, it provides soft comfort and insulation while flat-lock stitching and a raw-cut edge ensure a smooth, bulk-free fit. Contoured to cover the ears with reflective detailing at the back for visibility on low-light rides.

• Unisex thermal cycling skull cap
• Thermoflex fabric: warm, soft, and stretchy
• Flat-lock stitching for comfort under a helmet
• Contoured design covers ears
• Raw-cut edge lies flat without bunching
• Reflective detailing on back
• Weight: 33 g