FIBER-TECH BEAM CONSTRUCTION: Innovative Fiber-Tech Technology offers superior structural stability while maintaining a comfortable surface for a luxurious and refreshing spa experience HARD WATER TREATMENT SYSTEM: Built-in Hard Water Treatment System makes water gentler on skin, clothes and the entire spa system; hard water buildup limits water flow and reduces the life of your spa HEATED AIR BUBBLE TECHNOLOGY: The Positive Temperature Coefficient (PTC) heater is designed to maximize heat transfer to the water, while ensuring the highest level of safety, performance, and longevity ENERGY EFFICIENT SPA COVER: High density thermal-resistant foam provides extra insulation and minimizes heat loss; this cover enhances the Spa performance while improving the energy efficiency by as much as 50% PREMIUM ACCESSORIES: Everything you need for pure relaxation! Let your worries bubble away with 2 headrests (28506E) and a mood-setting multi-colored LED light (requires 3 AAA batteries, not included)