SUN SHELF RISER KIT: Only compatible with our Coast Modern Pool Lounge Chair; Adds 6 inches to your lounger to accommodate deeper baja shelves (9-18 inches) while maintaining the chair's sleek, high-end look TALLER SEAT HEIGHT: Added height can make it easier to get in and out your lounge chair, whether you use it inside the pool or on your patio; Supports up to 300 lbs ONE-TIME ASSEMBLY: Includes all necessary hardware for quick 2 minute installation, so you can get back to lounging in no time PRE-WEIGHTED: Includes built-in weights for extra stability in or out of your pool; Helps prevent your pool chair from floating in water or blowing over on your deck; Weighs a total of 29.5 lbs ALL-WEATHER DURABILITY: Made from heavy-duty, weatherproof HDPE with marine-grade, rustproof hardware; Withstands sun, chlorine, salt water, and outdoor elements for long-lasting use