The Sweet Home Collection encasement box spring protector offers quiet, breathable comfort while eliminating the passage of bed bugs to and from your box spring. The waterproof zipper completely locks out allergens and dust mites, ensuring the best 360 degree allergy protection available. This 100% waterproof protector fully encloses the box spring with a quiet, breathable fabric for a comfortable and healthy sleep environment. The waterproof membrane barrier allows air to pass for breathable comfort while protecting the box spring from fluids, spills and stains on all sides. Available in Twin XL, Twin, Full, Queen, King and California King. Fits box springs up to 12 inches deep.