Small Black Circulation Sandal: Increase Circulation, Reduces Fatigue... Stimulates blood flow, enhances circulation and reduces fatigue Upper layer of perforated honeycomb allows air and water to flow through Made from eco-friendly, adhesive- and solvent-free recycled materials Made from eco-friendly, adhesive- and solvent-free recycled materials Made from eco-friendly, adhesive- and solvent-free recycled materials