Aetrex Women's Classic 100% Double rocker sole to redistribute force away from rearfoot and metatarsal heads Rubber sole Double rocker role for pressure redistribution & lower body muscle stimulation Multi-density Polyurethane midsole for cushioning, shock absorption and even ride Strategically positioned fulcrum point provides comfort and encourges natural foot roll and body alignment. Slip-resistance rubber outsole pods for traction, stability and independent suspension Removable Mozaic Customization Technology to relieve pressure