Minimalist skull cap that fits under your helmet

We all know you lose a lot of heat through your head, which is not ideal when you're riding through the chill of an awesome Fall day. The lightweight Defend Skull Cap fits seamlessly under your favorite mountain bike helmet, while its insulated fabric helps help regulate heat and keep you warm and dry. Warmer riders ride longer.

• Lightweight, insulated fabric actively regulates heat to keep you warm and dry
• Minimalist design fits under most mountain bike helmets
• 94% polyester, 6% elastane