Zinus Jayanna 4 Inch Low Profile BiFold Box Spring / Folding Mattress Foundation / Strong…
- Box Spring
- Fabric, Steel
- 1
- 1
- Better rated than 82%
- More reviewed than 82%
A steel-framed, foldable Split King foundation built for tight-access moves and low-profile setups, not a mattress substitute.
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How it ranks among the 22 box springs we track
4.6★ across 7,200 Amazon ratings, Bayesian-smoothed toward the category average.
7,200 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
200+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 22 box springs we track - how the scorecard works · full box springs data report. Confidence: high - strong rating volume and complete data.Updated 5 days ago. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
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.
Strengths and trade-offs
Drawn from this product's published specifications.
- 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 |
|---|---|
| Model | OLB-BIFD-4K |
| Dimensions & fit | |
| Item Weight | 50.8 pounds |
| Item Dimensions | 79 × 75.5 × 4 inches |
| Size | Split King |
| Construction & materials | |
| Material Type | Fabric, Steel |
| Color | White |
| Included components | |
| Unit Count | 1 |
| Number of Packs | 1 |
| Included Components | Box Spring |
| Warranty & support | |
| Manufacturer Warranty Description | 5 years |
| Other details | |
| Number of Items | 1 |
| Item Type Name | Box Spring |
| Product Care Instructions | Spot Clean Only |
| Style Name | 4 Inch |
| Shape | Round |
Other Zinus box springs
How it compares
This product against the closest alternatives we track in box springs.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Zinus Jayanna 4 Inch Low Profile BiFold Box Spring / Folding Mattress Foundation / Strong…This product | 4.6 / 5 | 7,200 | 4.5 / 5 |
| Amazon Basics Smart Box Spring Bed BaseAmazon Basics | 4.4 / 5 | 38,700 | 4.4 / 5 |
| 5 Inch Box Spring for Queen BedTROZULER | 4.2 / 5 | 2,800 | 4.2 / 5 |
| EMODA 5 Inch Box Spring Queen Size Mattress Foundation with Fabric CoverEMODA | 4.2 / 5 | 2,800 | 4.2 / 5 |
| Maenizi 9 Inch Box Spring for Queen BedMaenizi | 4.3 / 5 | 1,600 | 4.1 / 5 |
Similar box springs from other brands
Questions about the Zinus OLB-BIFD-4K
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
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.