Birkenstock Men's Arizona (Black) 'Soft Footbed w. Blue Print' Low Slide Sandals [Latest Model] Birko-Flor - a synthetic material made of acrylic and polyamide felt fibers that is comfortable and tear resistant. This material has a synthetic leather-like finish with felt lined backing. Wipes clean with mild soap and water. Imported Two adjustable buckles for a custom fit. The soft footbed features a foam layer inserted between the cork layer and suede liner of the original Birkenstock footbed. Microscopic air bubbles cushion your feet while providing moderate arch support. Neutral heel profile and deep heel cup keeps the natural padding of your foot under the heel, distributing your body weight more evenly. EVA outsole offers lightweight, shock absorbing support with lasting durability. Footbed: Soft footbed - a foam layer is inserted between the cork layer and the suede liner of the classic Birkenstock footbed. This layer features an extremely high degree of rebound capacity which permits long-lasting cushioning.