The 180's Men's Chesterfield Ear Warmer keep your ears warm, dry, and comfortable on cold days with three layers of protection. This stylish winter accessory has a woven wool outer shell and 100% Primaloft insulation. The patented behind-the-head design fits comfortably over your ears and can be worn with hats, glasses, and helmets. The Chesterfield is adjustable, click-to-fit for a variety of head sizes. It also collapses for easy storage in your pocket, briefcase or glove compartment.