While it's a myth that you lose heat faster through your head than other body parts, it's true that when cycling in winter you quickly lose valuable body heat through uncovered areas. Your head has a large surface area, which is why we designed the GripGrab Lightweight Thermal Skull Cap to be worn under your helmet, keeping you warm and comfortable on cold winter rides. It is the lightest skull cap for winter riding in the GripGrab accessories range, with an insulating soft fabric lining and a high warmth-to-weight ratio — protection and comfort in cold weather without the bulky fit of a wool beanie. Made from light, breathable material, it keeps you comfortable when temperatures rise or you work up a sweat on a climb. Moisture is drawn away from the skin and evaporates quickly, keeping you dry and comfortable. Made specifically to be worn under a cycling helmet thanks to its elastic, pre-shaped fit, low-profile material and flat seams. Reflective logos and details on the front and back improve your visibility in low-light winter riding. Pro tip: wear a thermal neck warmer to fully cover your ears and neck for protection in the harshest winter weather.