The Hurley Phantom Free Women's Sandal features a Nike Free outsole for incredible flexibility, giving you a natural feel with every step. An ergonomic footbed mimics the shape of your foot for maximum comfort. Ultimate Flexibility Hexagonal grooves are hot-knife cut into the outsole, wrapping the sidewall to enable more natural motion. Secondary hexagonal and horizontal cuts intersect the flex grooves for even greater flexibility. Natural stride The heel and footbed mimic the shape of the foot, rolling with the ground to promote natural movement.