Abstract: A releasable binding system for the sport of snowboarding includes releasable toe and heel binding clip means secured to forward and rear ends, respectively, of the ski board and simulated toe and heel members for releasable engagement with the releasable toe and heel binding clips along an axis parallel to the longitudinal axis of the ski board. The simulated toe and heel members are secured, releasably or permanently to the booted feet of a rider. In one preferred embodiment, the release of one ski boot binding is sensed and causes the substantially simultaneous release of the other ski boot binding. In a further embodiment, an attachment is provided for converting a boot to snowboarding has a sole plate adaptor releasably secured to the sole of the boot with a releasable binding plate member having simulated toe and heel members which is adjustably coupled to the releasable binding plate member so that the simulated toe and heel members project laterally relative to the sole of the boot.