Merrell Women's Siren Strap Q2 Athletic Sandal Leather/Synthetic Imported Rubber sole Waterproof nubuck and webbing upper ; 3.0 mm lug depth Lycra neoprene lining for padded comfort Textured EVA Integrated footbed 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