Model: B222/02 FLEXX Upper: Nubuck Velcro Strap fastening Sole: Synthetic Padded insole Flexx Walk A Beat Sandal. Made with nubuck upper and synthetic sole is durable and flexible. Padded insole for more comfort. Velcro fastening for easy adjustment. Flaxible air pocket soles. Shock absorbing technology gives a relief on spine and knees. Creates the perfect microclimate for your feet, enhancing air circulation. The Flexx patented sole design maximizes flexibility, minimizes weight, absorbs shocks in order to relieve stress and pressure. Flexx use the best natural, hypoallergenic and breathable materials.