Spectrum is the first true cross-over boot which has been designed for riding that also gives great grip when walking. It incorporates Advanced Rider Technology Plus and Woof Wear's unique Profile Sole. Advanced Rider Technology Plus features:  Smart Traction - The Release Profile Sole resists movement in one direction only  Comfort - A shock absorbing Phylon mid sole and durable multi layered insole with gel comfort inserts give exceptional all day comfort.  Safety and Stability - The Release Profile Sole gives just the right amount of grip but releases safely from the stirrup. It also incorporates a steel shank for stability.  Waterproof - A waterproof and breathable membrane makes the boot suitable for use in all terrain and weather conditions. Colour Brown. Sizes 37, 38, 39, 40,41,42. Please note you will need to order 1 size bigger than usual!