The Sport-stirrup Is Designed To Help Prevent Ankle Injuries The Sport-stirrup Is Based On The Air-stirrup Ankle Brace But Has A Narrower Design For Less Bulk In A Sneaker Or Shoe The Sport-stirrup Has Anatomically Designed Shells That Prevent Inversion/eversion Each Shell Is Lined With The Patented Duplex Aircell System This Exclusive System Incorporates Two Pre-inflated Overlapping Aircells Distal And Proximal That Provide Support And Protection During Ambulation Features Semi-rigid Anatomically Designed Shells Prevent Inversion/eversion Patented Duplex Aircell System For Support And Protection Pre-inflated Aircells For Easy Application For Prophylactic Protection