Only PediFix Toe Separators feature 3 layers of our unique materials -- outer layers of soft PolyFoam and a middle layer of more sturdy PediSmart Foam make these soft yet durable; comfortable yet firm enough to keep problem toes apart. Gently divide crooked or overlapping toes to relieve between-toe corns blisters pinching and cramping. Soothe and prevent irritations by absorbing pressure. Make shoes comfortable. Washable reusable and effective for months. Size Guide: Sizing is based on width and length of desired separator not shoe size. Most choose Large or Medium for between Big and Index Toe. Medium and Small are chosen for other toes.