The literal differences
| Feature | Anti-Mite encasement | Waterproof fitted sheet |
|---|---|---|
| Current displayed price | $135 sale price | $179.10 sale price |
| Coverage | Zippered enclosure covers all six mattress sides | Fitted-sheet top and elastic sides |
| Waterproof | No | Yes, polyurethane film beneath the fabric |
| Primary job | Create a breathable barrier around the entire mattress | Keep spills and liquid from reaching the sleep surface |
| Fit | Five sizes; choose a 12- or 14-inch depth | Five sizes; listed 14-inch depth |
| Care | Machine wash; tumble dry low | Machine wash cold; line dry only |
| Warranty | Two years | Two years |
Prices, availability, care directions, and published terms were checked on KEETSA's US site on September 14, 2026.
Who benefits from each construction?
Choose full coverage
The Anti-Mite encasement makes sense when the sides and underside matter
A fitted protector leaves much of the mattress exposed. KEETSA's zipper closes the barrier around all six sides, which gives dust mites, related allergens, perspiration, and routine wear fewer exposed entry points. The breathable weave also preserves more airflow than a heavy plastic encasement.
Save $44.10 when: spill protection is not your main concern and you want the broader encasement. This is the lower-priced option and the only one here with 12- and 14-inch depth choices.
Choose liquid protection
Pay more for the Waterproof Fitted Sheet when spills are the real risk
The polyurethane film is the added functional layer: it stops liquid before it reaches the mattress. That benefit can justify the higher price in a child's room, guest room, or any bed where drinks, pets, or nighttime accidents make stain protection more valuable than wrapping the underside.
Choose the encasement instead when: you need all-six-side coverage, want a 12-inch fit, or prefer a protector that can go into the dryer. The fitted model must be line dried to protect its waterproof construction.
Complete the barrier around a KEETSA pillow
The matching Pillow Protector uses the same practical idea as the mattress encasement: a full zipper, breathable sweat-resistant fabric, and contour or traditional shape choices. It is a useful add-on when you want the pillow core protected from routine wear, but it is not waterproof.
Our recommendation
Buy for the problem you actually have. Choose the Anti-Mite encasement for breathable coverage around the whole mattress. Choose the Waterproof Fitted Sheet when preventing liquid damage matters more and you want easier removal. Adding both layers is reasonable when you need both jobs, but a single well-matched protector is the better value for most beds.
Browse all mattress protectors →KEETSA protector FAQ
Is the KEETSA Anti-Mite Mattress Protector waterproof?
No. KEETSA says the six-sided encasement is breathable and helps protect against dust mites, allergens, sweat, and everyday wear, but explicitly says it is not waterproof. Choose the Waterproof Fitted Sheet when liquid protection is the priority.
Which KEETSA protector is easier to wash and reinstall?
The Waterproof Fitted Sheet installs like a fitted sheet, so it is the quicker option for routine laundering. The full encasement takes more effort because the mattress must be enclosed on every side. The fitted protector must be line dried; the encasement can be machine washed and tumble dried on low according to its current care directions.
Does KEETSA offer returns on protectors?
KEETSA's current product pages say protectors follow the standard accessories return policy, and the Anti-Mite page states 90 days. The separate general refund page discusses mattress returns and says there are no comfort guarantees. Confirm the exact protector eligibility and any fee with KEETSA before ordering.
Do I need the matching pillow protector?
The pillow protector is useful when you also want a zippered, washable barrier around a KEETSA Contour or Traditional pillow. It is breathable and sweat resistant, but KEETSA says it is not waterproof.
Sources
Construction, price, availability, sizing, care, warranty, and return details were checked against KEETSA's current pages for the Anti-Mite Mattress Protector, Waterproof Fitted Sheet, Pillow Protector, and refund policy on September 14, 2026.