• Why Sleep Number?

    Why Sleep Number? – The Sleep Number® bed allows you to choose your firmness, comfort and support. Learn More

  • Beds

    Beds – All our mattresses feature exclusive DualAir technology View All Beds

    • Classic Series

      Discover Sleep Number® adjustable firmness
      on each side.

      Shop Now
    • Performance Series

      Adjustable firmness on each side, with enhanced pressure-relieving comfort

      Shop Now
    • Memory Foam Series

      The only Memory Foam beds with Sleep Number® adjustability

      Shop Now
    • Innovation Series

      Our most advanced innovations in sleep with adjustable firmness
      on each side

      Shop Now
  • SleepIQ®

    SleepIQ® – Discover the best sleep of your life and prove it. SleepIQ® Login

    Sleep Number® beds track and optimize your sleep with optional SleepIQ® technology.

    Learn More 

  • Pillows & Bedding
  • Specials
  • Find a Store

    Find Your Nearest Sleep Number® Store

    Over 450 Stores Nationwide

    Bellevue Square Store

    1st level West, near Nordstrom

    Bellevue, WA   98004-5019

    Store Hours

    Sun 11 AM- 7 PM
    Mon-Sat 9:30 AM- 9:30 PM

    Large Map
  • Need Help

    Need Help?

    Our Sleep Professionals are committed to improving your sleep.
  • Financing
  • InnerCircleSM
  • Order Status
  • My Account
  • Cart0
    Recently Added
    0

Assembly | Mattress


Assembly | FlexFit Adjustable Base

flex fit

Adjustable bases are delivered and installed by our Home Delivery technicians. To ensure ease of delivery and installation, please review the following information.

Assembly | DualTemp Layer

duel Temp assembly

Click below to view the instruction manual covering: assembly in six easy steps, using your remote, optimizing your DualTemp layer and more.

How do I attach the Sleep Number® modular base to my headboard or footboard?

You'll need brackets to attach your Sleep Number modular base to your headboard or footboard.

What are the dimensions of Sleep Number® modular bases?

Modular Base Size Length Width Height
Twin 74" 37.5" 8"
Twin Extra-Long 79" 37.5" 8"
Full 74" 52.5" 8"
Double 74" 52.5" 8"
Queen 79" 59.5" 8"
Expanded Queen 79" 65.5" 8"
King Eastern (Qty. 2) 79" 37.5" 8"
California King (Qty. 2) 83" 35.5" 8"
Grand King
(Queen + Twin Extra-Long)
97" 79" 8"

How do I attach legs to the Sleep Number® modular base?

For easy installation instructions for your modular base legs, please view our Guide to Attaching Base Legs .

  • To order legs, please click here or visit your local Sleep Number® store.

How tall are the legs for the Sleep Number® modular base?

Modular base legs are available in a standard profile height of 6.5" or a low profile height of 4.5". The standard profile legs allow for under-the-bed storage while the low profile legs position the bed closer to the floor.

Will the FlexFit Adjustable Base Fit my frame or furniture?

Base Size
Length Width Height
6.5" Legs
11" Legs
Twin Extra-Long 81.5" 39" 8" 13"
Full 76.5" 55" 8" 13"
Double 76.5" 55" 8" 13"
Queen 81.5" 61" 8" 13"
King Eastern 81.5" 77" 8" 13"
Split King 81.5" 77" 8" 13"
California King 85.5" 73" 8" 13"

Will the Home Delivery Professionals be able to get a FlexFit adjustable base into my bedroom?

Use the measurements to the right to ensure that the FlexFit adjustable base will fit through your hallways and into your room. Consider the obstacles below, which may prevent us from installing a FlexFit adjustable base in your home.

Room Entrance

Once inside the room, is there anything obstructing the Home Delivery Technicians from maneuvering the FlexFit adjustable base into the preferred area of the room for assembly?


Is your hallway wide enough to allow for turning the FlexFit adjustable base, if necessary, to move it into the room?


Due to the weight of the FlexFit adjustable base (up to 5 times heavier than a traditional box spring), it cannot be lifted waist high or over staircase railings or ledges to arrive at the desired destination.

Freight Elevator

Measure the height of the entrance to your freight elevator, as well as the depth and height of the inside of the elevator. If you live beyond the third floor in an apartment building or condominium and a freight elevator is not available, an additional charge may be assessed and delivery may be delayed if this information is not received in advance.