Serta Cool Nites Zippered Waterproof Mattress Encasements
Skip until Serta discloses waterproof treatment chemistry, PFAS risk unclear.
This zippered encasement uses an unnamed waterproof coating; Serta neither discloses PFAS presence nor holds environmental certifications.
The better-graded swap
Organic Mattress Protector 2-Pack
75/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Polyurethane/polyester blend with waterproof coating (type unspecified)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Are Serta Cool Nites Zippered Waterproof non-toxic? What it is made of
Serta Cool Nites encasements are a polyurethane and polyester blend with an unspecified waterproof coating applied to the fabric surface. Polyurethane itself is a stable plastic polymer, but the waterproof treatment layer is the safety concern, Serta has not publicly disclosed whether this coating uses PFAS-based durable water repellents (water-repellent coating), which are common in waterproof textiles but persist in the environment and accumulate in the body. The polyurethane backing may also off-gas volatile organic compounds (VOCs), especially in warm or humid conditions typical of bedroom use.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
Polyurethane off-gassing and VOC emissions
Polyurethane foam and coatings can emit volatile organic compounds (isocyanates, toluene, other solvents) particularly when new and in warm/humid conditions. While typically not acutely toxic at the low concentrations from a mattress encasement, chronic exposure in a bedroom environment warrants initial airing out. No specific testing results for Serta Cool Nites are on public record.
Waterproof coating degradation and leachables
The unspecified waterproof treatment will degrade with washing, use, and UV exposure. As it breaks down, any residual monomers or unreacted components in the coating could potentially migrate; if the coating contains PFAS-based water-repellent coating, breakdown may release PFAS precursors. Serta does not disclose the coating formulation, making long-term safety prediction impossible.
Mold and bacterial growth if moisture traps
If the waterproof coating fails or the zipper allows moisture ingress, the encasement can trap humidity inside, creating conditions for mold and bacterial growth that degrade mattress hygiene. This is a functional and indirect health risk rather than a chemical hazard, but relevant to long-term use safety.
What’s reassuring
Formaldehyde / VOCs
Polyester textiles can contain formaldehyde-based finishing resins for wrinkle resistance or sizing, though modern waterproof encasements often minimize this. No specific formaldehyde testing or disclosure exists for Serta Cool Nites; the brand has not ruled it out.
Source, ATSDR ↗Zipper and fastener materials
The zipper mechanism is likely brass or zinc-alloy with no lead or cadmium concerns on record, but Serta does not specify. Heavy metal content in zippers is not a typical hazard for this product category, but transparency is absent.
The full breakdown
The brand's record and disclosure
Serta, owned by Dorel Industries, has not published ingredient transparency statements or waterproof chemistry disclosures for its mattress encasement line. The brand has no publicly documented recalls specific to chemical contamination of these products. However, Serta's parent company has faced scrutiny for mattress flame retardant use in other product lines; the company has not adopted third-party certifications like OEKO-TEX or GOTS that would rule out hazardous chemicals in textiles. Silence on PFAS treatment in waterproof coatings is a significant gap given the widespread use of PFAS in this application.
How it compares in its category
Waterproof mattress encasements typically rely on either polyurethane, vinyl, or polyester-polyurethane blends. Serta's approach is conventional but lacks competitive transparency; some premium alternatives (e.g., Organic Textiles, Naturepedic) market PFAS-free or GOTS-certified waterproof encasements with disclosed materials. Budget-tier encasements often use PVC vinyl, which carries phthalate and chlorine concerns; polyurethane presents lower concern than vinyl but still requires confirmation of the waterproof coating chemistry. Serta's silence puts it in the middle-ground uncertainty tier.
If you buy it
Unpack and air out the encasement in a well-ventilated space (ideally outdoors) for 24-48 hours before putting it on the mattress to reduce polyurethane off-gassing. Use the zipper gently to avoid tearing the waterproof coating, which can degrade and lose effectiveness over time. Wash only as directed (typically cool water, no bleach) to preserve the waterproof layer. Replace every 3-5 years or if the coating visibly peels, cracks, or stops repelling moisture. Monitor for any persistent chemical smell; if present after airing, consider returning the product.
What we don’t know
- Basis
- Model estimate, 42% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Serta has made none
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Mattress Protectors
Parachute
Vintage Linen Bed Cover
- 100% linen, no reported coating
- We found no PFAS statement from the brand
- Heavy metals
3 hazards checked on this product. See all of them.
Brooklinen
Down Alternative Mattress Topper
- polyester down-alternative filling
- We found no PFAS statement from the brand
- Azo dyes and colorant migration
4 hazards checked on this product. See all of them.
Casper
Sleep Comfy Mattress Topper
- Polyurethane foam, cotton/polyester blend cover
- We found no PFAS statement from the brand
- Volatile Organic Compound (VOC) off-gassing
3 hazards checked on this product. See all of them.
More mattress protectors grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.