The soft, breathable 100% nylon mesh is made of interwoven material keeps feet cool and fresh. The low cut design is nearly invisible in shoes to provide discreet coverage for all day comfort. The non-binding elastic edge holds both feet snugly in place ― stretchable to fit most women's sizes between 4 to 9. Perfect for all-day wear in heels or flats. Protects your pedi too! Free Size, Suitable for UK 4 to 9 feet.