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 *