SAFETY:Both sides are equipped with rollers, which can effectively prevent the kayak from drifting and causing danger during installation. MATERIAL:Heavy-duty aluminum frame with padded eva foam to avoid scratching or damaging your car when installing the kayak on the car CONVENIENCE: One person can load a kayak or canoe on the roof of the car, which is convenient and fast FIRMNESS:4 adjustable straps are used for fixing, the stable right-angle structure is more reliable WIDE APPLICATION: SUV Load Assist for Kayaks, Canoes, Can be used to install on most vehicles, please note that the height of the booster should not be higher than the roof rack to make it easier to install the kayak.