Is the FlexFit 3 worth it over a basic adjustable base?

If you own a Sleep Number mattress and want app presets, split positioning and under-bed lighting, yes. If you just want head and foot raise, a plain base costs far less.

Does the split king include a mattress?

No. The price is for the base only. A split king base needs two twin XL mattresses, which Sleep Number sells separately.

Can I use my HSA or FSA to pay?

Sleep Number lists it as HSA/FSA eligible for qualified customers. Check with your plan administrator, since approval depends on your letter of medical necessity.

How does it compare with the FlexFit 2?

The FlexFit 3 adds app-based smart features and lighting over the simpler FlexFit 2. Choose the 3 if you want presets and Sleep Number app integration.

When is the best time to buy?

The listed $3,599.10 at Sleep Number as of November 4, 2026 already reflects 10% off. Holiday and Memorial Day sales are when Sleep Number typically discounts bases the most.

What do buyers say about the Sleep Number FlexFit 3 Smart Adjustable Base (Split King)?

Rated 4.7 out of 5 from 3 ratings.

Sleep Number FlexFit 3 Smart Adjustable Base (Split King)

Q: Where is the Sleep Number FlexFit 3 Smart Adjustable Base (Split King) cheapest?

At Sleep Number, for $3,599.10, as of our latest check.

4.7

Best price now

$3,599.10at Sleep NumberObserved at 11:15 PM

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Our take on the Sleep Number FlexFit 3 Smart Adjustable Base (Split King)

The FlexFit 3 is Sleep Number's smart adjustable base, sold here in a split king so each side of the mattress moves independently. It raises the head and foot, offers adjustable firmness-style positioning, and pairs with the Sleep Number app for presets and under-bed lighting. At $3,599.10 at Sleep Number as of November 4, 2026, it is the only new price listed, so there is no cheaper store to compare against. That price is 10% off the standard list, and it is HSA/FSA eligible for qualified buyers.