Arctic Shield Boot Insulators Large Black. Designed with a windproof and water-resistant polyester outer shell and liner these boot insulators are lightweight packable and perfect for outdoor adventures. Roll them up to fit conveniently in your pocket or backpack making them easy to carry wherever you go. Ideal for wearing over boots in cold conditions they provide an added layer of warmth and protection. Features of Arctic Shield Boot Insulators: Retain heat retention technology for maximum warmth Polyester outer shell and liner Windproof and water-resistant Lightweight and packable Rolls up to fit in your pocket or backpack Ideal for wearing over boots for added insulation Choose the next larger size if wearing over thick heavily insulated boots Retain heat retention technology Polyester outer shell and liner for durability Windproof construction for added warmth Water-resistant design for wet conditions Lightweight for easy portability Packable design rolls up to fit in a pocket or backpack Choose the next larger size if between sizes or wearing over heavily insulated boots Package Contents: Arctic Shield Boot Insulators Arctic Shield 523000-700-040-17: Boot Insulators Large Black