Birkenstock Womens Insoles famous blue footbed provides long term comfort and arch support to your non-Birkenstock footwear. Contoured arches and deep heel cup can help relieve heel pain and plantar fasciitis symptoms. With a silk lining that absorbs moisture and is hand-washable. Casual and Heeled Blue Footbeds are available in narrow, medium and wide widths. Based on the original Birkenstock footbed - Featuring pronounced arch support and a deep heel cup, the heeled footbed is for footwear with up to 1 1/2" heels Sole material: Made of natural cork and EVA - for a flexible, shock absorbing construction.