Classic two-strap style in a variety of materials with fully adjustable straps. Birkibuc made of acrylic and polyamide felt fibers, this material offers a textured finish that looks and feels like velvety nubuck. The original Birkenstock footbed featuring pronounced arch support, deep heel cup, and roomy toe box. Footbed molds and shapes to your foot. EVA sole for flexible, lightweight, durable and shock absorbing.