best firm mattress

Bestseller No. 1
Zinus Shawn 14 Inch Metal SmartBase Bed Frame / Platform Bed Frame / No Box Spring Needed / Sturdy Steel Frame / Underbed Storage, Twin XL
  • A ONE-AND-DONE SOLUTION - Why buy both a bed frame and box spring for your mattress? Our sturdy steel SmartBase lets you enjoy the benefits of both; and fear not - this hardworking frame only requires opposable thumbs to set-up
  • NO BOX SPRING NEEDED - Platform is made with heavy steel that replaces your box spring, allowing you to rest your memory foam or spring mattress directly on top; steel wires are spaced 4 inches apart; legs have plastic caps to protect your floors
  • UNDERBED STORAGE - Total of 13 inches of clearance space under the frame provides valuable storage room for extra odds and ends
  • QUICK, TOOL-FREE ASSEMBLY - Shipped in one compact box and requires no tools for assembly; rest your mattress directly on top of the platform; twin, narrow twin and twin XL sizes support a maximum weight capacity of 250 lbs, while all other sizes can support up to 500 lbs
  • Worry-free 5 year limited warranty included; mattress sold separately
Bestseller No. 2
Zinus Gene 16 Inch SmartBase Deluxe Mattress Foundation / 2 Extra Inches high for Under-bed Storage / Platform Bed Frame / Box Spring Replacement / Strong / Sturdy / Quiet Noise-Free, Twin XL
  • The 16 Inch SmartBase Deluxe eliminates the need for a traditional box spring and bed frame
  • 16 inches high with over 15 inches of clearance under the frame for valuable under bed storage space
  • Strong steel foundation with 2 non-slip pads for mattress stability included
  • Requires the use of SmartBase headboard brackets to connect to a headboard
  • Worry free 5 year limited warranty
Bestseller No. 3
Zinus Armita 7 Inch Smart Box Spring / Mattress Foundation / Built-to-Last Metal Structure / Easy Assembly, Twin XL
  • THE LAST BOX SPRING YOU’LL EVER NEED - Unlike a traditional box spring, the Armita is made of solid steel that comes together in no time and is backed by our Zinus “Peace of Mind” 5 year warranty
  • DURABLY ENGINEERED - Durable steel is used to construct the inside framework of this foundation; slats are spaced 6 - 7 inches apart; twin size supports a maximum weight capacity of 250 lbs, while all other sizes can support up to 500 lbs
  • 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
Bestseller No. 4
Zinus Demetric 14 Inch Elite SmartBase Mattress Foundation / for Big and Tall / Extra Strong Support / Platform Bed Frame / Box Spring Replacement / Sturdy / Quiet Noise Free / Non-Slip, Twin XL
  • The SmartBase Elite eliminates the need for a traditional box spring and bed frame
  • 14 inches high with 13 inches of clearance under the frame for valuable under bed storage space
  • Steel bed frame provides solid support, Best fit for Big & Tall people / Low-Stress, Easy Assembly in minutes with no tools required
  • Folding design allows for easy storage and movement through tight staircases and doorways
  • Requires the use of SmartBase headboard brackets to connect to a headboard
Bestseller No. 5
Classic Brands Claridge Upholstered Mattress Foundation | Platform Bed | Metal Frame with Wood Slat Support | Grey, Twin XL
  • 39" W x 80" L x 15" H
  • Steel frame with wood slat support system and sturdy center support
  • Can be used with any size mattress
  • Solid pine and spruce wood slats are held neatly together with a Velcro cover to prevent shifting
  • Low cost but quality alternative to Scandinavian type platform beds
SaleBestseller No. 6
Zinus Walter 7.5 Inch Smart Box Spring / Mattress Foundation / Built-to-Last Wood & Metal Structure / Easy Assembly, Twin XL
  • A MATTRESS GAME-CHANGER - Any decent mattress needs a good foundation behind it, and the Walter is one of our best; built with all of the trusted support we put into our ever-so-popular platform beds, this game-changing box spring has the total package - an unwavering steel structure, reliable, closely spaced wood slats and a compact, cleverly developed, well, package
  • DURABLY ENGINEERED - Durable steel and wood slats are used to construct the interior framework of this foundation; slats are spaced 2.5 - 2.9 inches apart; twin size supports a maximum weight capacity of 250 lbs, while all other sizes can support up to 500 lbs
  • FOAM PADDED TAPE is added to the steel frame for noise-free use and non-slip tape on the wooden slats prevents your mattress from moving
  • Dimensions and Weight: Twin XL: 79" X 38" X 7.5", 36.66 lb
  • THOUGHTFULLY PACKAGED - All parts, tools and instructions are packed into one compact box that ships straight to your door
Bestseller No. 7
Zinus Dawn 14 Inch Easy To Assemble SmartBase Mattress Foundation / Platform Bed Frame / Box Spring Replacement, Twin XL
  • 14 inches high with 12.5 inches of Clearance under the frame for valuable under bed storage space
  • Eliminates the Need for a traditional box Spring and bed frame
  • Compact design allows for tight spaces such as staircases and doorways
  • Multiple points of contact to the floor for level support / Sturdy Steel structure protects your mattress by providing strong level support
  • Requires the use of SmartBase headboard brackets to connect to a headboard
Bestseller No. 8
Zinus Armita 9 Inch Smart Box Spring / Mattress Foundation / Built-to-Last Metal Structure / High Profile / Easy Assembly, Twin XL
  • THE LAST BOX SPRING YOU’LL EVER NEED - Unlike a traditional box spring, the Armita is made of solid steel that comes together in no time and is backed by our Zinus “Peace of Mind” 5 year warranty
  • DURABLY ENGINEERED - Durable steel is used to construct the inside framework of this foundation; slats are spaced 6 - 7 inches apart; twin size supports a maximum weight capacity of 250 lbs, while all other sizes can support up to 500 lbs
  • HIGH PROFILE DESIGN - A 9 inch height is perfect for shorter mattresses or for those who enjoy their bed higher off 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
SaleBestseller No. 9
Zinus Armita 5 Inch Smart Box Spring / Mattress Foundation / Built-to-Last Metal Structure / Low Profile / Easy Assembly, Twin XL
  • THE LAST BOX SPRING YOU’LL EVER NEED - Unlike a traditional box spring, the Armita is made of solid steel that comes together in no time and is backed by our Zinus “Peace of Mind” 5 year warranty
  • DURABLY ENGINEERED - Durable steel is used to construct the inside framework of this foundation; slats are spaced 6 - 7 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 5 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
SaleBestseller No. 10
Zinus Justina Quick Snap Standing Mattress Foundation/Platform Bed/No Box Spring Needed/Navy, Twin XL
  • GOOD DESIGN AWARD WINNER - Awarded by the Chicago Athenaeum Museum of Architecture and Design in 2019 for innovative design and assembly
  • EASY ASSEMBLY, ZIP-FREE COVER - features bolt-free Quick Snap assembly for convenient and quick set-up; hooks and elastic loops hold the cover in place; all tools, parts, and instructions included in one smartly shipped box
  • NO BOX SPRING NEEDED - rest your memory foam, latex or spring mattress directly on top of this foundation for excellent support and extended mattress life
  • MULTIPLE COLORS AND SIZES - offered in an array of colors and extended sizes to suit any room size or home interior
  • Worry-free five-year limited warranty included; mattress sold separately

Compare The Top 10 twin xl mattress foundation

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