The calf strap is a neoprene-based support with hook and loop attachment straps and is supplied as a universal part which can be mounted onto shower chair frames and a wide range of wheelchair mobility bases, whether self-propelled attendant propelled or tilt in space options. It offers the effective positioning of the calf area, whether it be to encourage a positive position combined with foot positions or offering protection for an involuntary movement of the lower limb.