SMB Combo Knee Boot. The all-in-one solution you have been looking for that combines a Sports Medicine Boot with a Knee boot. The 2XCool performance liner creates the "Triple Chill Effect" by continuously drawing away heat and wicking sweat to keep legs cool and dry. The stretch Kevlar suspensory strap provides support and is durable. The extension at the inside top of the boot provides knee protections without interfering with the legs ability to bend. 30-Day Money-Back Guarantee/Six-Month warranty or as required by law. Sold in pairs.