The thick insert is reduced by about 1/2 the sizes, is suitable for loose shoes and prevents the heel from slipping out of the shoe. The thin insert is reduced by about 1/4 of the sizes, is suitable for slightly loose shoes and prevents heel blisters. Heel pads have an adhesive backing that keeps them in place. the self-adhesive backing and the padding on the inside of the heel. It can be easily put on and taken off when you don't want to use it. Designed to conform to the contour of the heel of the shoe. It is made of soft sponge, which makes it highly elastic, flexible and reusable. The heel pad insert is made of durable comfortable fabric with soft foam, so you can wear loose shoes comfortably. Our Heel Shoe Grips are highly elastic, flexible and shock-absorbing. They prevent your heel from chafing and your shoes from slipping. It is lightweight and has an ergonomic shape. A comfortable fit even for those who are sensitive to the heel. Reusable and washable. The 4 pairs of heel cushions ensure a long service life.