Don't leave your ears out in the cold--protect them in style| with Cuddl Duds' behind-the-head earmuffs complete with infrared lining.| Approx. dimensions; 4 x 5-1/3; One size| Adjustable frame| Collapsible for easy storage| Body| shell and lining; polyester/elastane; fill; polyester Cuddl Duds Men's Behind the Head Earmuff with Infrared Lining Black Size One Size