SNUG BOOTIE AT pursuing functional aspects as a gear boots for autumn / winter campers. Flame retardant FLAME STOPPER is used on the upper, and 3M Scotchgard water repellent is applied. The quilt batting uses 3M™ THINSULATE ™, a high-performance batting material that helps trap body heat, while allowing moisture to escape. ALL-TERRAIN SOLE and SHAKA IN-FOAM are used for extra comfort.