The Professional's Choice 2XCool Sports Medicine Boot 4 pack Large was designed around COOLING, COMFORT, and DURABILITY. This neoprene-free boot is constructed with ultra-lightweight, super-breathable materials that provide the support and 4-way stretch Professional's Choice boots are known for. The liner of the boot is made with 2XCool performance fabric by brrr°, a technologically-advanced textile that combines natural cooling minerals, active wicking, and rapid drying to create a "Triple Chill Effect" that instantly and continuously draws away heat and moisture. A new stretch Kevlar patch on the suspensory strap flexes with every step to provide ultimate support and durability without restricting freedom of movement. The Professional's Choice 2XCool Sports Medicine Boots featuring brrr° will keep your horse's legs cool, dry, and protected.