Zip & Block Twin XL Box Spring Encasement
Cover protects against household dust mites by completely encasing your box spring.
Per independent lab testing, Zip & Block products provide exceptional protection and clinical effectiveness against dust mite allergens.
The minimum average pore size of the vinyl in Classic Block Zip & Block bedding is less than 1.00 microns, which is well below the industry's maximum allowable pore size of 10 microns, thereby ensuring an effective barrier against dust mites.
Size: Extra long twin 39x80x9. Imported.