The interior length on both medium and large size boots does not exceed 16cm which makes them BS and International rules compatible Kevlar and shockproof protection behind a double density outer shell Anatomically shaped for comfort and ease of use Air-Tech ventilated neoprene inner layer lined with comfort dry lining (CDL) Double silicone ventilation vents Flex Tech zone for unrestricted movement Double locking Velcro straps Sold in pairs Your Kevlar Airtechnology Lite Fetlock Boots comes in a complimentary, reusable zip-fastened storage bag Premier Equine Kevlar Airtechnology Lite Fetlock Boots