Half Round Gravipod complements the shape of your half round umbrella stand. Shape allows for a perfect fit around virtually any sized umbrella base pole Simply wraps around the post - no need to lift Exclusive Heavy Duty 600D Duralast Ripstop polyester with PVC lining. Triple stitch-locked seams for ultimate holding power. Industrial Grade Velcro closure to lock the bag up tight. Simply install over your stand, fill with sand and you're ready to go. Holds 50 lbs./22.7 kg of play sand. Gravipod - Holding your stuff to the planet, Period. NOTE: *Sand and umbrella stand not included, product volume is approximately 0.5 cu/ft, please keep this in mind when shopping for sand. Gravipod Half Round design - simple and convenient. Just add your own sand. Designed to go around 3.0" umbrella base poles with a durable strap and buckle attachment system. Rugged and durable 600D Rip-stop polyester with PVC lining and triple stitch-locked seams. Adds up to 50 lbs/ 22.5kg of ballast to your existing umbrella stand, based on amount of sand added. Soft and easy on the toes, no hard edges to kick. No rust, dings or dents. Weather Resistant and Tear Resistant Spot clean only. When not in use, please remember to move your Gravipod inside for storage. For use with Half Round Umbrella umbrella stands Using a scoop or funnel, simply fill with 50lbs/22.5kg of clean dry sand. Capacity: Will hold up to 50 lbs/22.5 kg of sand. Warranty Length: 12 months