Pro Mesh TPU material literally breathes new life into the traditional Dressage/Sport boot by replacing the usually closed (non-breathable) PVC outer layer with an outer layer of tough, durable and fully breathable Pro Mesh TPU. When used over the top of the fleece or neoprene boot inner lining, Pro Mesh improves the performance of the Dressage/Sport in numerous ways. The Pro Mesh outer layer is more flexible, has more strength, and is more abrasion, tear and cut resistant than sheet PVC. Additionally, the boot conforms better to leg contours. In addition to letting heat escape and air in, Pro Mesh keeps sand and grit out.