Full Size Supports

Find the right foundation for restful nights with Full Size Supports from Mattress Firm. Explore options designed to complement your full size mattress and bedroom setup, with choices to suit your sleep space, style and budget.

Sort & Filter

Sleepy's Universal Box Spring Foundation

6474

Starting at

$249⁹⁹

Sleepy's Basic Box Spring Foundation

10736

Starting at

$219⁹⁹

Kingsdown Crown Imperial Box Spring Foundation

Starting at

$324⁹⁹

Tempur-Pedic Charcoal Box Spring Foundation

1408

Starting at

$380⁰⁰

Tempur-Pedic TEMPUR-Ergo 3.0 Adjustable Base

3980

Starting at

$1699⁰⁰

Kingsdown Wesley Collection Box Spring Foundation

Starting at

$375⁰⁰

Sleepy's Basics Easy Assembly Box Spring

201

Starting at

$149⁹⁹

Sleepy's Deluxe Adjustable Base

Starting at

$574⁷⁷

$1149⁹⁹

$575 OFF

Save $299 with qualifying mattress purchase. Code: ELEVATE

Tempur-Pedic Ultra Low Profile Foundation

338

Starting at

$380⁰⁰

Sleepy's Basic Adjustable Base

Starting at

$299⁹⁹

FREE with select mattress purchase³.

Sealy SX Box Spring Foundation

539

Starting at

$275⁰⁰

Sealy Ease Adjustable Base

5307

Starting at

$1049⁰⁰

Hollywood Enforce Platform Frame

306

Starting at

$299⁹⁹

Sleepy's Deluxe Platform Frame

501

Starting at

$239⁹⁹

Sleepy's Basics Platform Frame

Starting at

$119⁹⁹

Sleepy's Signature Adjustable Base

Starting at

$849⁹⁹

Save $299 with qualifying mattress purchase. Code: ELEVATE

Tulo Upholstered Platform Bed Frame

121

Starting at

$239⁹⁹

Sleepy's Bunkie Board

3346

Starting at

$99⁹⁹

Sleepy's Foldable Bunkie Board Foundation

109

Starting at

$119⁹⁹

Sleepy's Signature Upholstered Platform Bed Frame with Bench Storage

Starting at

$539⁹⁹

Sleepy's By Sealy Spring Plush Mattress

858

Starting at

$1449⁹⁹

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Toss and Turn
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Black Series Three 16.5" Firm Pillow Top Mattress

302

Starting at

$4129⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Series One 14.5" Plush Pillow Top Mattress

286

Starting at

$2629⁰⁰

Plush Comfort, best for

Side Sleepers
Pain
Temperature
Allergies
Bed Partner
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Tempur-Pedic TEMPUR-ProAdapt 2.0 12" Soft Mattress

3548

Starting at

$3349⁰⁰

Plush Comfort, best for

Side Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Beautyrest Black Series Three 16.25" Medium Pillow Top Mattress

487

Starting at

$4129⁰⁰

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Stearns & Foster Estate 15" Firm Euro Pillow Top Mattress

2810

Starting at

$2649⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Allergies
Toss and Turn

Receive $300 Instant Gift⁴ with purchase.

Full size supports create a stable foundation for a mattress measuring approximately 54 inches wide by 75 inches long. Because the center of a full size mattress carries much of the weight placed on the bed, a frame with support only along the outer edges may allow the middle to dip over time. The right support system helps distribute weight evenly, keeps the mattress level and may reduce the movement, creaking and shifting that can make a bed feel less secure. It can also help protect the condition of the mattress and bed frame, especially when the support is properly sized and installed according to the manufacturer’s requirements. Common full size support options include center support rails with floor-contact legs, wooden or metal slats, solid bunkie boards and platform frames with built-in support. A center support system typically runs from the head of the bed to the foot and uses one or more vertical legs to transfer weight to the floor. Slats extend from side to side across the frame, while a bunkie board provides a flatter, more continuous surface between the mattress and the frame. A platform frame may combine the frame and support structure in one design, which can simplify setup and eliminate the need for a separate foundation in some bedroom arrangements. The best choice depends on the frame you already have, the mattress construction, the amount of clearance you want beneath the bed and the support requirements listed by the mattress manufacturer.

Before choosing full size supports, take a close look at the bed frame rather than assuming that every support will fit every setup. Measure the interior width and length of the frame, note whether it has existing center rails or legs and check the distance between each slat. A support that is too short may shift when the bed is used, while one that is too long may press against the side rails and create unnecessary strain. Slats should be strong enough for the mattress and sleeper weight, spaced according to the mattress manufacturer’s guidelines and secured so they do not slide or roll. If the frame has a wide open area beneath the mattress, a center rail with legs that rest firmly on the floor can add important reinforcement. Adjustable metal supports can be useful when an older frame needs added structure, but they still need to be positioned correctly and tightened after installation. A bunkie board can provide a more even surface when a frame’s slats are too widely spaced, although it is important to confirm that the board’s thickness and material are compatible with the mattress and the available clearance. Platform frames with integrated slats offer a clean, straightforward option for a bedroom refresh, particularly when you prefer a lower-profile look or want to avoid adding a separate foundation. Always review the mattress and frame warranties before making a purchase, since some manufacturers specify the number of support points, the maximum gap between slats or the requirement for center support and floor-contact legs. A solid foundation cannot correct every comfort issue, but it can give the mattress a dependable surface so its intended feel is easier to experience.

Full size beds are a practical choice for guest rooms, children’s rooms, apartments and bedrooms where a queen would take up more space. They give one sleeper room to stretch out while leaving space for a nightstand, dresser or reading chair, and they can accommodate two people when needed. Full size supports are helpful when replacing an older frame, moving into a new home or preparing a guest room for visitors during the cooler months, when a comfortable sleep space feels especially welcoming. They can also be a thoughtful housewarming gift for someone furnishing a first apartment, setting up a child’s room or updating a room after a move. If you are giving support as a gift, confirm the recipient’s mattress size and frame type first, since a full size foundation will not fit a twin, queen or king setup. For another compact bedroom size, explore Twin Size Supports. During installation, place the frame on a level surface, make sure every leg reaches the floor and check that rails, brackets and fasteners are secure. After the mattress is in place, walk around the bed and listen for movement, then recheck the connections if anything feels uneven or noisy. With the right dimensions and adequate center reinforcement, full size supports help create a steadier sleep surface, preserve useful bedroom furniture and make everyday rest feel more settled from bedtime through morning.

What are full size supports made from? + -

Full size supports are commonly made from steel, wood or a combination of materials. Check each product description for details about its construction and finish.

Do full size supports require assembly? + -

Assembly requirements vary by design. Some supports arrive ready to use, while others may require connecting parts or attaching hardware.

What styles of full size supports are available? + -

You can find support options with streamlined metal designs, traditional wood construction and adjustable features to suit different bedroom setups.

How do I clean full size supports? + -

For most supports, wipe the surface with a soft, dry or lightly damp cloth. Follow the manufacturer’s care instructions for specific materials and finishes.

Can full size supports work with different bed styles? + -

Support designs vary, and some are made for use with specific bed frames, foundations or headboards. Review the product details to understand which setup each support is designed for.