Mattress Safe® Stretch Knit Box Spring Encasement with the patented “Zipper with the Hook”®. A sewn in loop and zip-tie is included to ensure tamperproof encasements. Color encasements are made at the time of order. Please allow 10 – 15 days for production.
- Bed Bug Certified
- Breathable
- Fire Retardant: CFR Title 16 Part 1632
- Impermeable to Bed Bugs and Dust Mites
- Patented "Zipper with the Hook"®
- Plus+ Advantage Sizes
- Single and "Split" Box Spring Sizes (see chart below)
- Comes with Felt Corner Protectors
- For additional protection, use the
Felt Full Frame Box Spring Encasement Protectors
Manufactured In USA

Do You Have A "Split" Box Spring?
Before ordering your box spring encasement, make sure your mattress has a single or a "split" box spring set. If you have a King or Queen mattress, use the table below to order the proper box spring encasement for your box spring configuration.
| Mattress Size | Box Spring Configuration | Order This Box Spring Encasement |
| Queen ( 60"x80" ) |
Split |
Order 2 Split Queen Box Encasements |
| Queen ( 60"x80" ) |
Single |
Order 1 Queen Encasements |
| King ( 78"x80" ) |
Split |
Order 2 Twin Plus+ Encasements |
| King ( 78"x80" ) |
Single |
Order 1 King Encasements |
| California King ( 72"x84" ) |
Split |
Order 2 Cal Twin Plus+ Encasements |
| California King ( 72"x84" ) |
Single |
Order 1 King Plus+ Encasement |
| Hotel King ( 72"x80" ) |
Single |
Order 1 King Plus+ Encasement |

Single Box Spring
Plus+ Advantage® Sizes
Plus+ Advantage® sizes stretch to fit a variety of mattress depths and lengths, including regular and long sizes. Plus+ Advantage® brings you the versatile answer to mattress and box spring protection.
- The Twin Plus+ Mattress Encasement stretches to fit Twin and Long Twin.
- The Full Plus+ Mattress Encasement stretches to fit Full and Long Full.
- The King Plus+ Mattress Encasement stretches to fit California King and Hotel King.
Learn More About the Plus+ Advantage
How To Measure Your Mattress Correctly
It is important to properly measure your mattress and box spring frame before purchasing an encasement. Due to hygiene and bed bug concerns, we are unable to accept exchanges and returns on opened or used products. For more information, please review our return policy.
Learn How To Measure Your Mattress
Warranty:
10 YEAR MATTRESSSAFE.COM LIMITED WARRANTY
If you purchased your product from MattressSafe.com, Mattress Safe® offers a 10 year limited retail warranty.
Mattress Safe® products are the finest in mattress protection, made with the highest quality materials and workmanship available. We stand behind our product and offer a 10 year warranty to MattressSafe.com customers from date of purchase. Your protector is warranted for the first 3 years non-prorated with replacement at no charge and prorated 1/10 of cost per year thereafter.
Your protector is warranted against defects in workmanship and material. Structural damage caused by abuse, misuse, improper installation or not properly following the care instructions will void the warranty. The zipper portion of the encasement or item is only covered under this warranty for a period of one year.
DO NOT IRON. DO NOT USE BLEACH OR ANY PRODUCTS CONTAINING BLEACH. DO NOT USE BORAX OR ANY DETERGENT CONTAINING BORAX. IRONING OR THE USE OF BLEACH OR BORAX WILL VOID THE WARRANTY.
Mattress Safe® is not responsible for any incidental or consequential damages resulting from the use of its products. In no event shall the responsibility of Mattress Safe® exceed the purchase price of the warranted product. Mattress Safe® is solely responsible for the product and its limited warranty.
HOW TO ACTIVATE YOUR WARRANTY
You must register your product at http://mattresssafe.com/warranty-registration/ for the warranty to be activated. Warranty will not be honored without proof of purchase.
2 Piece Queen Box Spring:
For 2-piece Queen box spring order 2 Split Queen encasements.
2 Piece King Box Spring:
For 2-piece King box spring order 2 Twin Plus+ encasements.
2 Piece Cal King Box Spring:
For 2-piece Cal King box spring order 2 Cal Twin encasements.
Cal King or Hotel King Box Spring:
For Cal King or Hotel King Box Spring order 1 King Plus+ encasement.