Mabis DMI AllerTech Cold Weather Mask Features: Effective in sub-zero temperatures; this Artic Fleece mask warms the air inhaled; no matter how cold or dry. Enhanced with a particle filter lining. Takes the risk out of breathing cold air. Adjustable latex ear loops allow for a personalized and comfortable fit, Rolls up for easy storage. Long lasting, Washable, and Adjustable latex ear loops. Works in sub-zero temperatures.