What Our Gearhead(R) Experts Are Saying:"I use the Summer Skullcap anytime temps rise. It's thin enough to disappear under my helmet but does a great job soaking up sweat and letting air flow through. It's a simple piece, but it makes a big difference on hot, sunny days."Warm-weather rides are better when we can keep distractions to a minimum, and the Castelli Summer Skullcap does exactly that. Designed as a low-profile layer beneath our helmet, it keeps sweat out of our eyes and lets cooling airflow in-so we can stay focused on the road ahead. With a soft wicking fabric that lines the front and a mesh top panel for maximum ventilation, the Summer Skullcap is the piece we forget we're wearing-until we realize we're not wiping our face every few minutes. It fits snugly and comfortably, adding function without bulk for long summer miles.