Orthopedic-Grade Arch Support: a TPU bridge redistributes 66 % of plantar pressure—compared with only 40 % for plastic arches—relieving pain from plantar fasciitis and flat feet. Triple-Layer Impact Defense: a PU base cushions your arch for plantar fasciitis relief, Premium PORON material in the forefoot pad shields the balls of your feet, and a rigid TPU heel cup locks the springs in place—lasting twice as long as foam or gel insoles.