The Costway 4-Piece Fillable Umbrella Base Stand is designed for unmatched stability and durability, crafted from high-strength HDPE material that is waterproof and aging-resistant. This innovative umbrella base features four large refillable reservoirs, enhancing wind resistance and ensuring a secure hold for your patio or garden umbrella. Installation is a breeze with its tool-free design, and the interlocking plates can be easily stacked for compact storage when not in use. The ventilated holes at the bottom increase friction for superior stability, making it ideal for both residential and commercial settings including coffee shops and poolside areas. Note: Umbrella not included.