Mountain Horse Sovereign High Rider Riding Boots in Black. The Mountain Horse Sovereign High Rider Riding Boots are stylish tall boots made from hard wearing, premium selected leather that gives a beautiful shine making them perfect for competition wear. The Sovereign High Rider Boots feature ShockXâ ¢ technology in the footbed which boosts an ergonomically designed cushion footbed with a builtin 850 º steel shank for improved stability while riding and walking and the High Densityâ ¢ outsole provides excellent grip and durability with ripple zones for increased performance. The Sovereign High Rider Boots also feature the unique MH Prolaze Stretch-Flexnotchâ ¢ which makes it far easier for your foot to sit in the correct heels down position. The Sovereign Boots offer a durable YKK zip down the back of the boot, hidden elastic down the inside shaft for a more custom fit, an elegant Spanish top and Mountain Horse branding to the side.