The most effecient way to carry multiple whitewater kayaks. Four boat maximum capacity. Tying boats down is now easier than ever with the upper bridge design. Easy carrier transfer from vehicle to vehicle with proven universal hardware. For a clean look when not in use, The Stacker folds down flat. Includes one pair ratcheting tie downs, two straps and buckle protectors. Fits Thule bars, Yakimaź bars, and most factory installed rack. Please call us toll free at (800)690-5220 or click the following link to see what Thule Rack and Fit Kit you need to RACK YOUR CAR.