Zinus Jayanna Low Profile BiFold Box Spring Split King
- Size: Split King
- Material Type: Fabric, Steel
- Shape: Round
- Item Weight: 50.8 pounds
Last refreshed Sep 9, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A steel-framed, foldable Split King foundation built for tight-access moves and low-profile setups, not a mattress substitute.
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ASIN: B01HIR5FYSCategory: Box Springs
Sizes Available
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Overview
A 4 inch low-profile bi-fold box spring foundation for a Split King mattress, with a steel frame under a poly jacquard cover and no assembly required.
This is a foundation, not a mattress, and its main feature is the bi-fold hinge that lets the base fold in half for moving through doorways, up stairs, or into an elevator. Split King sizing means two twin XL-width foundations rather than one king-size piece, so this is meant to be paired with a matching second unit under a Split King mattress or mattress set. The 4 inch height keeps the overall bed lower than a traditional box spring would.
- 4 inch low-profile height
- Bi-fold steel frame design
- Split King sizing
- No assembly required
Who it's for
Fits anyone setting up or replacing a foundation under a Split King mattress who needs to carry it through tight hallways or stairwells. Not the right match for a standard King, Queen, or Twin mattress, since this is sized and sold for Split King.
Pros and cons
- Folds flat for moving through tight spaces
- No assembly required, opens on its own
- Low 4 inch profile lowers total bed height
- Sized for Split King only, not standard King
Performance notes
The steel frame folds flat for transport and then opens back to its full box-spring shape without tools or hardware, which is the entire point of the bi-fold design over a rigid one-piece foundation. At 4 inches, it sits lower than a traditional 9 inch box spring, which changes total bed height when paired with a mattress. Because Split King means two separate twin XL-width foundations, this listing covers one piece of what is typically a two-piece set.
Specifications
| Brand | Zinus |
|---|---|
| Dimensions & fit | |
| Size | Split King |
| Item Weight | 50.8 pounds |
| Item Dimensions | 79 × 75.5 × 4 inches |
| Construction & materials | |
| Material Type | Fabric, Steel |
| Color | White |
| Included components | |
| Number of Packs | 1 |
| Unit Count | 1 |
| Included Components | Box Spring |
| Warranty & support | |
| Manufacturer Warranty Description | 5 years |
| Other details | |
| Shape | Round |
| Number of Items | 1 |
| Style Name | 4 Inch |
| Item Type Name | Box Spring |
| Product Care Instructions | Spot Clean Only |
Closest rivals on specs
ALDRICH 9 Inch Heavy Duty Metal Box Spring King- Item Weight 50.8 vs 41 pounds (+24%)
Greaton Amish Made 4 Inch Wood Box Spring Queen- Item Weight 50.8 vs 40 pounds (+27%)
EMODA 5 Inch Metal Box Spring with Cover Queen- Item Weight 50.8 vs 33 pounds (+54%)
Frequently asked questions
Does the Zinus Jayanna OLB-BIFD-4K fit a regular King mattress?
No, it is sized and sold specifically for Split King, which uses two twin XL-width foundations rather than one King-size piece.
Do I need tools to set up the Zinus bi-fold box spring?
No assembly is required. It folds out from its shipped, folded state into its full box-spring shape.
How tall is the Zinus Jayanna foundation?
It has a 4 inch low profile, lower than a traditional box spring.