Built with Windbloc breathable wind-proofing technology, the Mountain Hardwear Dome Perignon is a timeless classic winter cap that keeps your head warm in nature's most windy and chilly conditions.Features:Windproof and breathable, with a fleece-lined ear band for comfort Full ear coverage for warmth Stretch fleece back panel creates a snug fitFabric: Toasty Tweed Remake See "Overview" below for sizing information.