Muck Boot The Original MuckBoots Brit Colt Equestrian Boot 100% Fabric and synthetic Rubber sole Shaft measures approximately 18" from arch Heel measures approximately 1 1/4" Platform measures approximately 1/2" Boot opening measures approximately 14 1/2" around Added toe protection with a wrap-up bumper Outsole is rugged, aggressive, and durable Natural rubber upper reinforcement Contoured footbed 100% waterproof, lightweight, and flexible