Merrell Women's Siren Flip Q2 Athletic Sandal Leather/Synthetic Imported Rubber sole Heel measures approximately 1" Platform measures approximately 0.5 inches Waterproof nubuck and webbing upper Lycra neoprene lining for padded comfort QFORM 2 dual-density midsole with heel-centering technology provides gender-engineered alignment and comfort Merrell air cushion in the heel absorbs shock and adds stability M Select GRIP tunes each outsole with durable traction that grips when and where you need it