The Perfect Fit heel liner series, available in both thick and extra thick variants, are designed to help alleviate the discomfort and skin irritation caused by unwanted foot movement when walking in loose footwear. Its unique, seven-millimeter-thick padded design helps cradle your heel in place for a snug and well-cushioned walking experience. Perfect Fit Extra Loose Shoes is best suited for very loose footwear. Thinner alternatives include Perfect Fit Loose Shoes and Comfort Grips.