This 4-plate cantilever umbrella base filled with water or sand is a durable base for your outdoor umbrella. Constructed of heavy-duty HDPE plastic with weather-resistant UV protection, it can prevent color from fading and is easy to maintain. And it can be filled with 145 lbs of sand or 115 lbs of water, increasing the additional weight to the plates and keeping your patio umbrella stand perfectly in windy conditions. Thus, you don't need to worry any puff of wind may disturb your summer relaxation in the shade, allowing you to enjoy your leisure time.