{"product_id":"serta-sleeptrue-firm-11-in-king-hybrid-mattress-in-a-box-cooling","title":"Serta Sleeptrue Firm 11 in King Hybrid Mattress in a Box - Cooling","description":"\u003cp\u003eOur review of the Serta Sleeptrue Firm 11 in King Hybrid Mattress in a Box finds it best for sleepers who want targeted support and cooling in a convenient, delivered package. The single biggest reason to consider this mattress is the combination of \u003cstrong\u003e3 support zones\u003c\/strong\u003e and a hybrid coil core that gives firmer spine alignment for back sleepers while the \u003cstrong\u003ecool twist gel memory foam\u003c\/strong\u003e layer helps mitigate overheating. It arrives compressed in a box for straightforward setup and balances pressure relief with durable support suitable for everyday use.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupport Zones:\u003c\/strong\u003e Three distinct support zones are designed to deliver firmer backing under the lower spine and softer cushioning where shoulders and hips need it most.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCool Twist Gel Memory Foam:\u003c\/strong\u003e Gel swirled into the memory foam enhances airflow and heat dissipation so the sleeping surface feels cooler through the night.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContouring Hybrid Support:\u003c\/strong\u003e Individually wrapped Serta 800 Edition coils provide responsive, localized support while increasing breathability compared with all-foam builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathable Materials:\u003c\/strong\u003e A soft, breathable cover and Pillow Soft Aire foam layer promote airflow and added surface cushioning for comfortable pressure relief.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMattress-in-a-Box Delivery:\u003c\/strong\u003e The mattress ships compressed and rolls out easily at home, expanding over 24 to 72 hours with a brief airing period for any initial odor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis mattress is a strong option for back sleepers and combination sleepers who want firmer spinal support without sacrificing the contouring feel of memory foam, and for anyone who values cooling features on the sleep surface. The hybrid coil layer makes it a good match for those who need enhanced edge support and breathability compared with standard all-foam models.\u003c\/p\u003e\n\u003cp\u003eLightweight side sleepers seeking a very plush, hugging surface may prefer a softer mattress, and those who require an ultra-firm medical-grade bed should look elsewhere. If you need same-day setup or an adjustable base with special foundations, check compatibility before purchase.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTargeted \u003cstrong\u003esupport zones\u003c\/strong\u003e help with lower back alignment and reduce pressure in key areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling memory foam\u003c\/strong\u003e reduces heat retention compared with traditional memory foam layers.\u003c\/li\u003e\n\u003cli\u003eIndividually wrapped coils add durable support and improved airflow for night-long comfort.\u003c\/li\u003e\n\u003cli\u003eDelivered compressed for easy home setup and comes with a 100 night trial and 10 year limited warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFirmness is debated among buyers, so sleepers who prefer clearly soft or very firm may find the feel subjective.\u003c\/li\u003e\n\u003cli\u003eSmall initial off-gassing is possible and may take one to two weeks to fully dissipate despite generally low odor reports.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSerta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSleeptrue Firm 11 in King Hybrid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eHybrid with memory foam and individually wrapped coils\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling Layer\u003c\/td\u003e\n\u003ctd\u003eCool twist gel memory foam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport System\u003c\/td\u003e\n\u003ctd\u003eSerta 800 Edition custom support coils with 3 support zones\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCover \u0026amp; Comfort\u003c\/td\u003e\n\u003ctd\u003eBreathable cover with Pillow Soft Aire foam layer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrial \u0026amp; Warranty\u003c\/td\u003e\n\u003ctd\u003e100 night trial and 10 year limited warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Serta Sleeptrue Firm 11 in King Hybrid is a practical choice for sleepers seeking zoned back support and cooling memory foam in a convenient mattress-in-a-box format; it balances durable hybrid support and pressure relief at a value-oriented price and is particularly well suited to back and combination sleepers who want a firmer, breathable sleep surface.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow long does it take to fully expand?\u003c\/strong\u003e\u003cbr\u003eThe mattress unrolls immediately but can take up to 72 hours to fully expand and one to two weeks to air out completely.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the foam certified?\u003c\/strong\u003e\u003cbr\u003eThe mattress uses CertiPUR-US certified foam, indicating independent standards for emissions and durability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat trial and warranty are included?\u003c\/strong\u003e\u003cbr\u003eThe mattress includes a 100 night trial and a 10 year limited warranty for peace of mind.\u003c\/p\u003e","brand":"Serta","offers":[{"title":"Default Title","offer_id":48177203937499,"sku":"B0DFS7NKD7","price":492.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81GzMaRKhUL._AC_SL1500.jpg?v=1769618446","url":"https:\/\/gearmusthave.com\/products\/serta-sleeptrue-firm-11-in-king-hybrid-mattress-in-a-box-cooling","provider":"GearMustHave","version":"1.0","type":"link"}