The Birkenstock brand arch support inserts are an investment in your health. The inserts mold to your feet which provide comfort for shoes with up to 1.5" heels. They stay fresh with the moisture absorbing silk lining and are hand-washable. These blue foot beds are recommended by doctors to people suffering from plantar fasciitis. Relieve your foot pain with the contoured arches and deep heel cup to give the feet proper support. The flexible, shock absorbing construction enables you to stay active all day long!