The Simms Challenger Insulated Hat is the perfect way to stay warm and comfortable on the water. This lightweight, low-profile hat is constructed with an insulated fabric that provides optimal warmth and comfort in any weather condition. It also features a GORE-TEX® membrane which makes it fully waterproof, windproof, and breathable. The adjustable chin strap ensures a secure fit, and the removable fleece ear flaps keep your ears warm.