1mm shell provides durability without adding weight, fully lined shell with foam to provide excellent protection and padding to entire ankle. Contoured foam foot piece to secure two pieces without rubbing or adding bulk. Gel pack with air and hot/cold feature for multiple uses. Fully adjustable, moveable straps for easy fit. Worn comfortably inside laced shoes. Cleans easily with soap and water. Universal sizing; one size fits most. Complete instructions for use included. Made in the USA.