Product details:

Rollerfly is a patent-pending, four piece set of hard plastic plates designed to have a universal fit among the many different brands and models of leg pads. The plates can easily be strapped on to almost any current legpad. The plates are embedded with ball bearings that allow the goaltender to roll laterally while in the kneeling, butterfly position. Ice hockey goalies can use this product to practise their butterfly slide movements at home.