ProStretch Double - Dual Calf And Foot StretcherProStretch Blue Double Original Dual Calf and Foot Stretcher allow you to vary stretching levels, exercises and time spent by exercising both feet simultaneously. It helps relieve and stretch the plantar fascia, tight calf, foot, and hamstring muscles far more effectively than conventional methods. For over 30 years, ProStretch has been the favorite calf stretcher of professional athletes, athletic trainers, and physical therapists worldwide. Proven