Best Firm Spring Mattress King in 2022 [*Top Picks*]

Looking for the best firm spring mattress king on the market? We’ve got you covered. Check out our ratings of absolute bestsellers below and make a final decision.

893 Reviews Scanned

  • ZINUS Quick Lock Metal Smart Box Spring / 7.5 Inch Mattress Foundation / Strong Metal Structure / Easy Assembly, King
    Bestseller #1
    ZINUS Quick Lock Metal Smart Box Spring / 7.5 Inch Mattress Foundation / Strong Metal Structure / Easy Assembly, King (386)
      HASSLE & HEADACHE FREE - The Quick Lock Metal Smart Box Spring comes together with easy-to-follow instructions, fewer bolts and absolutely no headaches; assembly that’s intuitive and packaging that seems to defy the laws of physics - now that’s what we call a new-age box spring DURABLY ENGINEERED - A durable steel frame is used to construct the interior framework of this foundation; twin size supports a maximum weight capacity of 350 lbs, while all other sizes can support up to 700 lbs THOUGHTFULLY PACKAGED - All parts, tools and instructions are packed into one compact box that ships straight to your door ASSEMBLY THAT’S A SNAP - Quick Snap assembly system means that this box spring comes together quicker and with fewer bolts Worry-free 5 year limited warranty included; box spring only, a bed frame or platform bed is required to support this foundation and is sold separately
  • Signature Design by Ashley Better than a Boxspring RTA Foundation, 14 Inch Mattress Riser, King
    Bestseller #1
    Signature Design by Ashley Better than a Boxspring RTA Foundation, 14 Inch Mattress Riser, King (386)
      MATTRESS RISER: Storage and reliable support all in one—what a convenient unit. This riser allows you to take advantage of additional storage space underneath STURDY CONSTRUCTION: All metal frame construction with headboard brackets included UNDER BED STORAGE: The tall clearance leaves tons of space for you to keep storage bins and boxes under the bed KING SIZE: Includes 2 risers to accommodate a king size bed; measures 75" W x 79" D x 14" H QUICK SET UP: Follow instructions for fast, easy assembly. No tools needed. Mattress is available and sold separately DIRECT FROM THE MANUFACTURER: Ashley Furniture goes the extra mile to package, protect and deliver your purchase in a timely manner BUY WITH CONFIDENCE: Designed and manufactured by Ashley Furniture Industries. The trusted source for stylish furniture, lighting, rugs, accessories and mattresses. For every taste and budget
  • Leesa King Size Bed Mattress Foundation, Gray
    Bestseller #1
    Leesa King Size Bed Mattress Foundation, Gray (386)
      Designed and manufactured in the USA Strong & Sturdy: high-quality wood and a center support beam create a solid base for your Leesa or Leesa Hybrid mattress. Beautifully upholstered: our slate Gray twill Fabric foundation cover is made with design in mind to Perfectly pair with your Leesa or Leesa Hybrid mattress. Easy to assemble: four corner pins secure the outer rails, a middle support rail slides into place and covered slats roll out in a seamless piece. Sleep easy with our 5-year limited manufacturer's
  • Zinus Keenan 14 Inch Free Standing Smart Box Spring / Mattress Foundation / With 9 Support Legs / Strong Steel Structure / Easy Assembly Required, King
    Bestseller #1
    Zinus Keenan 14 Inch Free Standing Smart Box Spring / Mattress Foundation / With 9 Support Legs / Strong Steel Structure / Easy Assembly Required, King (386)
      Strong and Sturdy steel structure Convenient and compact packaging All tools included for assembly. Worry free 5 year limited warranty / Box Spring only, Bed frame sold separately Available in Twin, Full, Queen, King Note : The size 76 x 80 x 14 includes the box spring and the legs of the product
  • Kyvno 12
    Bestseller #1
    Kyvno 12" Gel-Cooling Premium Memory Foam Mattress Adjustable Bed Frame Combo, Wireless Remote, Zero Gravity, TV/PC Position, Medium Firm, CertiPUR-US Certified (Split King) (28)
      ADJUSTABLE BASE: (2) Twin XL Bases. Both sides can be adjusted together or separately. This “Whisper-Quiet”, Fully Adjustable, Upholstered Split King bed base adjusts to your needs with the touch of a button! Customizing your bed position improves quality of sleep and maximizes recovery each night. SPECIAL FEATURES INCLUDE: Fold-able Hinge System - Makes Base Compact & Easy to Move; Tool-Free Assembly; Compatible with All Mattress Types; Emergency Power Down Feature WIRELESS REMOTES: (2) Wireless remote with additional “One-Touch” button positions: Flat, Anti-Snore, Zero Gravity, and TV/PC. These preset buttons can also be reprogrammed to your favorite, most therapeutic positions, to fit your lifestyle. Whether you’re recovering from injury, working from home, streaming movies, reading or eating in bed, Kyvno adjusts to your needs. MATTRESS: (2) Twin XL - 12 Inch, Medium Firm, Gel-Cooling Memory Foam. Our mattresses are infused with Gel-Cooling Beads and are designed to Promote Air Circulation, Eliminate Motion Transfer, and Provide Even Body Weight Distribution for ideal body support. Our mattresses are CertiPUR-US Certified, therefore certified to be made without harmful materials, heavy metals or ozone depleters. Includes: Non-Slip; Removable/Washable Mattress cover that can be machine washed and dried on gentle. 120 DAY SATISFACTION GUARANTEE – Sleep on and test out your bed up to 120 days. If it’s not a match made in heaven, contact us for a HASSLE FREE - FREE RETURN & PICKUP, NO RESTOCKING FEES. No need to disassemble or pack, we take care of the entire return. 10 YEAR WARRANTY: Covers Entire Bed including Mattress, Base, Wireless Remote Control, and All Electrical Components. Contact us for more details!
  • Greaton 4-Inch Box Spring/Low Profile/Fully Assembled/Strong Wood Structure, King, Black
    Bestseller #1
    Greaton 4-Inch Box Spring/Low Profile/Fully Assembled/Strong Wood Structure, King, Black (386)
      EFFORTLESS CARRYING: The boxspring easily navigates tight passageways and entranceways by splitting in two. Fits through tiny stairwells or tight hallways with ease and you can enjoy it out too. DESIGNED TO ENDURE: Designed using a solid hardwood brackets made of light yet sturdy element, thus preventing the sheet from bending over and breaking, therefore maintaining the size and shape of the mattress. Box Spring lays under the Mattress. ENHANCED SUPPORT: The frame is crafted from deluxe wood cover that's reinforced for extra durability and strength. It allows the platform to be robust and stable, neither shake nor squeak. It's perfect for those who want a no-replacement, maintenance-free and un foldable bedstead. PRE-ASSEMBLED: The bedbox is Pre-assembled and ready to install, just take off the packaging and you are set to go which helps fityou the bedder. No requirement of any tool. UNIVERSAL COMPATIBILITY: In order to be able to get your serenity sleep lighthearted, the product can be used on medium gel, memory foam, latex and hybrid cushions matress. We manufacture our bedding frames only adjustable with strict basic quality standards. SUPERFAST DELIVERY: A mainstay compact design with very quick and easy shipment. There is no requirement of any Parts, tools, and instructions. MATTRESS PROFILE: The 4" Split Box Spring/Foundation will give you an ideal height for your high-profile sleeping pad while the 8" box spring will give you an short support for your low-profile bedding. AVAILABILITY: Twin, Twin-XL, Full, Full XL, Queen, King and California King sized. We have two profiles of the item in 4" and 8" thickness and also two-color White and Black.
  • Signature Design by Ashley 10
    Bestseller #1
    Signature Design by Ashley 10" Mattress Box Spring with Metal Foundation, King, Black (386)
      INNOVATIVE BED FOUNDATION: Need support for a king size mattress? Catering to a busy lifestyle, it is the perfect alternative to the standard box spring and it's the last foundation you'll ever need STURDY METAL CONSTRUCTION: Built to last and designed for durability and longevity, this box spring is constructed of sturdy metal instead of wood. It features a removable fabric cover and rounded corners for added safety UNIQUE SHIPPABLE DESIGN: The perfect alternative to the standard box spring, it is ready to assemble in the comfort of your home. It features a removable fabric cover and rounded corners for added safety DIMENSIONS: 75.63" W x 78.75" D x 9.88" H. This item is also available in all other sizes, including california king and twin XL ASSEMBLY REQUIRED: Easy-to-follow instructions, hardware and tools included. Two people recommended. All parts, tools and instructions are packed into one compact box that ships straight to your door DIRECT FROM THE MANUFACTURER: Ashley Furniture goes the extra mile to package, protect and deliver your purchase in a timely manner BUY WITH CONFIDENCE: Designed and manufactured by Ashley Furniture Industries. The trusted source for stylish furniture, lighting, rugs, accessories and mattresses. For every taste and budget
  • Zinus Tonja Platform Bed / Mattress Foundation / No Box Spring Required / Brown, King
    Bestseller #1
    Zinus Tonja Platform Bed / Mattress Foundation / No Box Spring Required / Brown, King (386)
      Updated styling with strong wood slat mattress support Easy to assemble and no Box Spring needed mattress sold separately Wood headboard and frame with metal interior support Non-slip tape on the wooden slats prevents your mattress from moving Worry free 5 year limited warranty
  • Zinus Edgar 4 Inch Wood Box Spring / Mattress Foundation / Sturdy Wood Structure / Low Profile / Easy Assembly, King
    Bestseller #1
    Zinus Edgar 4 Inch Wood Box Spring / Mattress Foundation / Sturdy Wood Structure / Low Profile / Easy Assembly, King (386)
      NATURAL WOOD INTERIOR - Engineered with thicker wood slats than most traditional box springs, this strong and steady solid wood frame is ideally suited to support memory foam or latex mattresses DURABLY ENGINEERED - Durable wood is used to construct the interior framework of this reliable foundation; slats are spaced 2.8 – 3.4 inches apart; twin size supports a maximum weight capacity of 250 lbs, while all other sizes can support up to 500 lbs LOW PROFILE DESIGN - A 4 inch height is perfect for taller mattresses or for those who enjoy their bed lower to the floor THOUGHTFULLY PACKAGED - All parts, tools and instructions are packed into one compact box that ships straight to your door Worry-free 5 year limited warranty included; box spring only, a bed frame or platform bed is required to support this foundation and is sold separately
  • ZIYOO 14 Inch Platform Metal Bed Frame/3500lbs Heavy Duty/Strengthen Wooden Slat Support/Mattress Foundation/No Box Spring Needed/Quiet Noise Free, Twin/Twin XL/Full/Queen/King/Cal King (King)
    Bestseller #1
    ZIYOO 14 Inch Platform Metal Bed Frame/3500lbs Heavy Duty/Strengthen Wooden Slat Support/Mattress Foundation/No Box Spring Needed/Quiet Noise Free, Twin/Twin XL/Full/Queen/King/Cal King (King) (109)
      Reinforced strength and durability, 20% stronger&heavier than normal bedframe, meets the delicate sleep for the Big & Tall. Sub-zone supportive steel&wood construction design, multiple points bed-legs and widened wooden slats provide excellent support, increase mattress life. Unique integrated structure makes the bed frame more comfortable & firm, quiet noise-free, non-shake and prevents structural twisting. Eliminates the need for box spring, perfect fits heavy memory foam mattress and traditional mattress. Headboard or footboard compatible, allows for valuable 12 inches storage space under the mattresses.
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