Water Fillable Cantilever Umbrella Base. Exclusively Designed to be used with the Shade Trends 11 ft. Trigger Lift Cantilever Umbrellas. Made from durable Polypropylene Plastic - weighs only 29 lbs. "empty". 154 lbs. completely filled. Shade Trends Umbrellas focus on being unique and functional - features many original umbrella designs - including patented tilt and crank components, strong ribbed aluminum poles, lightweight yet durable aluminum rib design, reinforced cover pockets, and attractive, long lasting canopy fabrics.