Search  for anything...
Zinus

Zinus 7 Inch Twin XL Metal Smart Box Spring with Quick Assembly, Mattress Foundation, Strong Metal Frame, Easy Assembly

  • Based on 17,790 reviews
Condition: New
Checking for the best price...
$89.98 Why this price?
Save $9.02 was $99.00

Buy Now, Pay Later

As low as $15.00 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 90-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Apr 24
Order within 11 hours and 45 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Size: Twin XL


Style: 7 inch


Pattern Name: New Quick Assembly


Features

  • TWIN XL DIMENSIONS - The dimensions of this XL twin size box spring are 78.7 x 38 x 9 inches. The length is 5 inches longer than our Standard Twin size. Please measure your bedframe to ensure compatibility.
  • EASIER THAN EVER ASSEMBLY - As if its ultra-durable steel structure and convenient packaging werent impressive enough, this new box spring features tool-free locking brackets for intuitive setup, assembly takes only minutes to complete
  • DURABLY ENGINEERED - Durable steel is used to construct the inside framework of this foundation; twin/twin xl sizes support a maximum weight capacity of 350 lbs, while Full, Queen & King sizes can support up to 700 lbs
  • THOUGHTFULLY PACKAGED - All parts and instructions are packed into one compact box that ships straight to your door
  • Worry-free 5 year limited warranty included; box spring only, a bed frame or platform bed is required to support this foundation and is sold separately

Description

As the backbone for solid mattress support, a box spring that falls short can make or break your night’s sleep. We developed the Smart BoxSpring® with unbeatable durability and rock-solid stability to keep your mattress in shape for years to come. And our latest quick assembly version gives you total confidence when it comes to setup, requiring fewer bolts and ingeniously designed with easy to use, tool-free brackets. With our simple, step-by-step instructions on hand, you’ll have this foundation built and ready to use within minutes. Built with a strong and durable steel frame and a versatile poly jacquard cover that slips right on, the Smart BoxSpring® is the picture of dependability for any mattress. All packed in a compact shipping box with everything included, even our 5-year worry free warranty! Now that’s peace of mind you can sleep on.

Size: Twin XL


Material: Alloy Steel, Fabric


Product Dimensions: 78.7"L x 75.5"W x 7"H


Style: 7 inch


Special Feature: Durable


Other Special Features of the Product: Durable


Included Components: Steel Frame, Cover


Brand Name: Zinus


Manufacturer: Zinus


UPC: 841550325331


Global Trade Identification Number: 31


Manufacturer Warranty Description: Worry-free 5 year limited warranty included.


Manufacturer Part Number: ZU-ABS-7XS


Model Number: ZU-ABS-7XS


Item Type Name: Box Spring


Material Type: Alloy Steel, Fabric


Product Care Instructions: Wipe with Dry Cloth


Required Assembly: Yes


Assembly Instructions Description: Assembly instructions are provided and are user-friendly, but the specific details are not explicitly stated.


Style Name: 7 inch


Color: Grey


Finish Types: Steel


Furniture Finish: Alloy Steel


Form Factor: Bed Frame


Shape: Rectangular


Compatible With Mattress Size: Twin XL


Maximum Weight Recommendation: 350 Pounds


Size: Twin XL


Item Dimensions L x W x H: 78.7"L x 75.5"W x 7"H


Item Weight: 25.76 Pounds


Ground To Item Distance: 7 Inches


Item Dimensions: 78.7 x 38 x 7 inches


Item Depth: 9 inches


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Apr 24

Yes, absolutely! You may return this product for a full refund within 90 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Very sturdy and surprisingly quiet
Size: King Style: 9 inch Pattern Name: New Quick Assembly
I’m honestly impressed with this foundation. I bought the king size and was expecting it to be heavy and complicated, but it was actually very easy to put together. The frame feels solid once it’s assembled, and it doesn’t wobble or shift when you get in and out of bed. What I like the most is that it makes absolutely no noise. No squeaks, no movement sounds at all. The support is firm in a good way, and the surface feels steady under the mattress. It also doesn’t weigh as much as I expected, so moving it around wasn’t a problem. Overall, it looks clean, feels durable, and holds the mattress perfectly without sliding. The height is perfect to match the regular bed headboard. (4 " works )Great buy. ... show more
Reviewed in the United States on November 19, 2025 by Amaris23
    • Best Purchase Ever
Size: Queen Style: 5 inch Pattern Name: New Quick Assembly
I never write product reviews, but this was such an awesome purchase. This is the BEST box spring I have ever owned. If you’re on the fence about buying this product, or you’re trying to decide between options, here’s a number of reasons to go with this one. 1. Noise Level: NONE. Completely silent. This was my #1 reason for wanting a new box spring in the first place, and it does not disappoint. Our previous box spring (the traditional wood/spring kind) had become squeaky over the years, and kept waking up our 5 month old baby. This new box spring hasn’t made one tiny noise since day one - our baby has been sleeping through the night. Relief is an understatement. 2. Sturdiness: I have never felt so supported by my bed. It feels even better than when our previous box spring was brand new, so I know it’s not just because it’s new. I have chronic shoulder pain, and while a new box spring obviously isn’t a cure, I have been waking up significantly less sore for the first time in years. My husband doesn’t have the same pain issues, but he agrees that our bed feels much more sturdy and comfortable, because our bodies are better supported. 3. Assembly: So easy. I am not in my greatest shape (I did just have a baby), but I was able to put it together without my husband’s help. The box comes with some screws and an Alan key, and that’s honestly all that’s needed. The directions are pretty easy to follow. I will say that the “Up” stickers were placed on the parts in a way that was a little confusing at times, but if you pay close attention to the pictures in the instructions, you’ll be fine. It took me less than an hour. I cannot recommend this box spring enough. Do yourselves a favor and purchase this. You can thank me later. :) ... show more
Reviewed in the United States on February 11, 2025 by cnelson1102
    • Don’t buy - too creaky
Size: Queen Style: 7 inch Pattern Name: New Quick Assembly
Easy to assemble but it is so creaky! I tried tightening it every time it would creak again but the logistics behind that are just a pain in the butt. Investing in the foundation from the place I purchased my mattress instead. My friend recommended this to me and she has no issues with noise so maybe I got a defect? ... show more
Reviewed in the United States on March 20, 2026 by Lauren A. Peterson
    • Perfect solution for box
Size: Full Style: 5 inch Pattern Name: New Quick Assembly
We got a new bed frame for my young teen son which required a box spring mattress. I was not looking forward to having another giant mattress to drag upstairs. This frame was the perfect solution at a great price. The delivery box wasn't too big (compared to a full-sized mattress), and it was pretty easy to put together in just a few minutes. It seems to be pretty sturdy. I also like that it came with a fabric cover, although, it did have a small tear which won't even be noticeable with the main mattress on top. ... show more
Reviewed in the United States on July 31, 2025 by RPowell
    • Good Value Modifications Recommended
Size: Full Style: 9 inch Pattern Name: New Quick Assembly
The Positives: -It was pretty simple to assemble (or would have been see cons). Just 6 screws. Straightforward instructions. Minimal parts to connect. -It feels solid with two adults and a child in it. -Not Noisy so far. Silent in fact. I was concerned about it being noisy so I added electrical tape at all metal to metal contact points. Particularly the end of the cross braces. This made things fit tighter and there shouldn't be any metal rubbing together now. Can't say this made the difference but it is quiet. -Price. Local retailers were quoting me 2-3 hundred for a traditional box spring. Apparently they aren't commonly used anymore which is the reason stated for the high prices. -The cover was easy to fit. It's basically just a fitted bed sheet. Cons: -No surprise, the metal is the typical cheap Chinese pot metal. -The machining for one of 6 screw holes was missing most of it's threads. This made it impossible to assemble using the screws provided. Thankfully I had a box of nuts and bolts and was able to complete the assembly without the screw. -Two of the cross braces didn't have the plastic grommet in the end of them. This would have meant extra metal to metal contact. I remedied this by fashioning my own grommet out of furniture foot pads. I shouldn't have needed to do this but I'm sure it will work better now anyway. Tip: Use electrical tape at all metal to metal contact points to avoid noisy metal to metal friction. This was at the end of cross braces and then the center contact point where 4 screws are connected. Summary: It was a very cheap solution that seems to solve the problem. If you don't have a little Macgyver ability you might want to avoid this. The quality of the material and machining matches the price. Ease of assembly with simple instructions is a plus. Will update if the thing falls apart. Update 3/4/26: Still holding up. Haven't had to tighten anything and it's still quiet. Keep in mind though that this is being used for a childs bed but Mom and Dad do spend a fair amount of time getting in and out of it. ... show more
Reviewed in the United States on December 9, 2024 by Beau
    • Easiest thing ever
Size: Queen Style: 9 inch Pattern Name: New Quick Assembly
This thing has to the easiest product i have ever put together. It only took 4 screw and plastic parts. The slats we bifold slats so when unhinged them they run the entir width of the bed.
Reviewed in the United States on April 1, 2026 by Amazon Customer

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...