Premium Merino wool cable knit-shell Primaloft® Gold Eco insulation Recycled eco-fleece lining Jacquard woven logo Patented behind-the-head design Adjustable click-to-fit frames for a variety of head sizes Compatible with earbuds, glasses, hats & most bike helmets Fits discreetly under long hair Fully collapsible for easy storage in a pocket, purse, briefcase or bag