The Birkenstock Arizona is a classic, unisex, two-strap sandal in a variety of materials with fully adjustable straps and shock-absorbing EVA sole. Upper materials: Leather or Suede - Thick yet supple leathers without additional dyes to keep the leather breathable, durable and comfortable. Upper material: Nubuck - Quality leather is buffed for a soft and velvety finish. Upper material: Birkibuc - Made of acrylic and polyamide felt fibers, this material offers a textured finish that looks and feels like velvety nubuck. Upper material: Birko-Flor - Made of acrylic and polyamide felt fibers, this material is a soft fabric with a smooth leather-like finish. Footbed: Original Birkenstock footbed - Features pronounced arch support, deep heel cup, and roomy toe box. Footbed molds and shapes to your foot. Sole material: EVA - Flexible, lightweight, durable and shock absorbing.