What Our Gearhead(R) Experts Are Saying:"I keep this in my jersey pocket for every cool morning ride since it takes up almost no space. It cuts the wind off my ears without ever feeling tight under my helmet."Cold ears can ruin a good morning ride faster than cold hands, and Castelli built the Pro Thermal 3 Headband to shut that down before it starts. We love how the Thermoflex fabric goes on soft and stretchy, sealing out the wind under a helmet without adding any bulk, so the only thing left to think about is the ride ahead.