Keep your patio umbrella securely in place with this Heavy Duty Sand/Water Fillable Patio Offset Cantilever Umbrella Weighted Base. Made of durable HDPE material with a 3D surface, this umbrella base is hard and weather-resistant, UV-resistant, waterproof, and stable. Fill it with sand or water to add weight and keep your umbrella in place during windy conditions. The classic design is easy to clean and store, and it includes four grooves for easy handling. Please note that the umbrella is sold separately. Warm Tips: lf you purchase our cantilever umbrella, please note that that before assembly, this base needs to be filled full withwater and sand mixture (sand : water=2:1). or for safety reasons, please add an additional 2 sandbags so that the cantilever umbrella can be supported and prevented from tipping over, so that it can support the cantilever umbrella. Additional Details: