Fit & Design: Acrylic and polyamide felt fibers form upper for nubuck-like, tear-resistant finish Felt lined straps with adjustable buckles for ultimate comfort and fit Care instructions: Wipe clean with mild soap and water In-Shoe Comfort: Iconic BIRKENSTOCK(R) footbed is comfortable and offers all-day support Deep heel cup supports the foot tissue and holds the heel bone firmly in its natural position Heel mould activates the calf muscles, stabilizes the back of the foot, and improves gait and coordination Added support for the interior and exterior arch Transverse arch support runs through the middle of the footbed and stabilizes the metatarsal bone for a solid stance Raised indentations at the front of the footbed ensure that the toes remain loose and spread out in their natural position Drawn up footbed protects the toes during the rolling motion of the foot Durability & Traction: Flexible, lightweight, durable and shock absorbing EVA outsole