Leather clog featuring adjustable buckle strap at vamp and contoured cork footbed Roomy toe box to promote balance and correct alignment Raised toe bar encourages natural gripping motion of feet Deep heel cup cradles heel Timeless Birkenstock clogs with an adjustable strap at the instep. Smooth leather upper and suede footbed. Cork midsole and EVA sole. Birkenstock is known for comfort, and this Boston clog is proof. Featuring the brand's signature footbed design which provides unbeatable stability and optimal arch support, this shoe is great for casual hikes, strolls in the park, and relaxing on a lazy day.