Meet the CalfPRO: a calf stretching device that holds your heel in the right position for a proper stretch. It lets you stretch with max torque by using your heel as a fulcrum point. It doesn’t bend your toes backwards either. You can use it with shoes, socks, and barefoot.
The CalfPRO has an ultra soft heel padding and collapsible hinge. You can find out more about it here.