This am-637l 5 person Lounger spa by American Spas features 37 jets crafted to maximize spa performance & deliver the highest quality hydrotherapy & relaxation experience. Designed to exceed expectation, American Spas use a patented 7-layer Laminate system, Known as fiber steel construction, which is reinforced with steel & wood to create the strongest shell in the industry. To further ensure durability & performance, This spa is built from the thickest acrylic available to keep the shell strong at critical stress points. & with the highest resin-to-fiberglass mixture & thickest fiberglass backing in the industry, you can feel confident that your new Spa is built with quality. This spa includes a Freedom sound system with 4 waterproof speakers & a subwoofer for incredible sound. The built-in wireless Bluetooth technology lets you control your music through a smart device from anywhere inside or outside your hot tub. Designed to meet strict standards in efficiency, insulation & sanitation, this 5-person Lounger spa uses smart technology to run efficiently & use less energy. Insulation keeps hot water in & cold weather out to reduce power needs & the energy saver thermos layer insulation blanket provides an extra layer of protection for your hot tub from the elements. To protect your spa & investment, a premium Hydro-Armor tapered spa cover provides the final layer of insulation & protection. Energy-efficient & rated to withstand 1, 500 uv-hours of protection to prevent cracking, splitting, or fading, The Hydro-Armor tapered spa cover is designed with a tapered height that angles downward from the center to the sides to drive off rain & prevent precipitation from pooling.