Castelli Summer Headband Whether you're racing your carbon rocket ship, running trails, or playing a chouette game of tennis, nothing says "Lets kick some ass!" like wearing a headband. The Castelli Summer headband is one you'll be glad to have around your crown when the sun beats down. It's Stretch mesh back panel keeps air flowing comfortably throughout, while it's Polyester stretch fabric wicks moisture away and allows it to fit seamlessly under just about any helmet. Features: Polyester stretch fabric on front for great wicking Stretch mesh back Fits under helmet Temperature Rating: 10deg-25degC / 50-77degF Weight: 21 grams | Castelli Summer Headband Men's in Black