{"product_id":"hardside-400sx-super-waveless-waterbed-mattress","title":"400SX Super Waveless Waterbed Mattress with Back Support, for Hardside Frames","description":"\u003ch2\u003e400SX Super Waveless Hardside Waterbed Mattress — S-Class Series\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat is a Hardside Waterbed?\u003c\/strong\u003e A hardside waterbed uses a rigid wooden frame that the water bladder sits inside directly. It has the classic, traditional waterbed look and feel. Unlike a softside waterbed — which fits inside any standard bed frame — a hardside requires a dedicated waterbed frame.\u003c\/p\u003e\u003cp\u003eThis listing is for the \u003cstrong\u003ebladder only\u003c\/strong\u003e. Hardside cover systems are available separately and can enhance comfort and protect your bladder — but they are \u003cstrong\u003enot required\u003c\/strong\u003e for use with a hardside waterbed frame.\u003c\/p\u003e\u003ch3\u003e400SX Specs\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e S-Class\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWave Level:\u003c\/strong\u003e Super Waveless — 2nd most waveless overall\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Seven comfort layers including three lumbar support layers and tethered wave control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest For:\u003c\/strong\u003e Sleepers who prioritize back support and near-zero motion transfer\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWarranty — S-Class Series\u003c\/h3\u003e\u003cp\u003eCovers seam and valve related leaks from date of purchase:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eYears 1–5:\u003c\/strong\u003e Full replacement (excluding shipping)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLifetime:\u003c\/strong\u003e Pro-rated\/discounted replacement (excluding shipping)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOptional Hardside Cover Systems\u003c\/h3\u003e\u003cp\u003eA cover system adds a quilted top and safety liner to your hardside setup. All include a safety liner:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.sterlingsleep.com\/products\/factory-select-hardside-waterbed-mattress-cover\"\u003eFactory Select Hardside Waterbed Mattress Cover\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.sterlingsleep.com\/products\/sterling-waterbed-hardside-plush-top-with-quilted-belgium-damask\"\u003ePlush Top with Quilted Belgium Damask\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.sterlingsleep.com\/products\/belgium-damask-pillowtop-replacement-for-hardside-waterbeds\"\u003eBelgium Damask Pillowtop\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eRecommended Accessories\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.sterlingsleep.com\/products\/solid-state-325w-deep-fill-waterbed-heater-pad\"\u003eWaterbed Heater Pad — Solid State 325W\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.sterlingsleep.com\/products\/waterbed-fill-and-drain-kit\"\u003eFill \u0026amp; Drain Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.sterlingsleep.com\/products\/sterling-8-oz-water-mattress-conditioner\"\u003eWater Mattress Conditioner (2-Pack)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHardside vs. Softside — What’s the Difference?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardside (this product):\u003c\/strong\u003e Bladder sits inside a dedicated wooden waterbed frame, traditional look, classic wave feel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoftside:\u003c\/strong\u003e Foam-encased, fits any standard bed frame, looks like a regular mattress, easier to move\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003e*Hardside frame, heater, fill \u0026amp; drain kit, and conditioner sold separately.\u003c\/em\u003e\u003c\/p\u003e","brand":"Sterling Sleep Systems","offers":[{"title":"California King  72in x 84in","offer_id":20154775765090,"sku":"400CK","price":549.99,"currency_code":"USD","in_stock":true},{"title":"Queen 60x84","offer_id":20154775797858,"sku":"400Q","price":549.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2213\/6863\/files\/Sterling-waterbed-bladder-400SX-water-mattress-hardside-waterbed-deep-fill.jpg?v=1717182339","url":"https:\/\/www.sterlingsleep.com\/products\/hardside-400sx-super-waveless-waterbed-mattress","provider":"Sterling Sleep Systems","version":"1.0","type":"link"}