Birkenstock Birko Sport Two Part Arch Support.The Birko Sport Arch Support - Sport system provides support and cushioning when you need it the most!This two-part arch support system is made specifically for sports shoes.The blue foam insole retains memory of your foot providing all-day comfort.The cork heel cup forces your foot in the proper alignment and helps keep the padding under the heel bone for cushioning on impact.Hand wash lightly with mild detergent.Made in Germany.