Cal King Mattress Protector
Avoid until Casper discloses coating chemistry or certifies PFAS-free.
Casper's mattress protector features waterproof and stain-resistant coatings without public disclosure of chemistry or PFAS status. Mattress protectors typically use PFAS-based durability treatments, and unverified coatings become a red flag without transparency or certification.
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Material
Polyester blend with waterproof/stain-resistant coating (unspecified chemistry)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Waterproof / stain-resistant treatment
Water-repellent treatments have historically contained PFAS chemicals.
Category baseline
PFAS exposure happens more often with clothing products.
No PFAS disclosure
The company has not publicly discussed PFAS in this product.
PFAS
Casper has not disclosed the chemistry of the stain-resistant and waterproof coating. Many polyester mattress protectors use PFAS-containing water-repellent coating (water-repellent coating) treatments; without confirmation, assume possible presence.
Source: ATSDR ↗Coating degradation and leachables over time
Waterproof coatings on textiles degrade with repeated washing and body heat. As the coating breaks down, particulates or monomers may leach into the mattress, bedding, and potentially skin contact zones.
Formaldehyde / VOCs
Polyester textiles and some waterproof finishes can be treated with formaldehyde-based resins for wrinkle resistance or durability. Casper has not ruled this out; off-gassing is typically low in established products but possible on first use or in poorly ventilated spaces.
Source: ATSDR ↗Microplastics
Polyester textiles shed microfibers with washing and use. A mattress protector in direct contact with skin and bedding will release small fibers over its lifetime; long-term inhalation or ingestion risk is not fully characterized for low-level household exposure.
Source: EPA ↗What’s reassuring
Heavy metals
No public records of azo dye violations or heavy metal contamination in Casper mattress protectors. Casper's manufacturing likely complies with basic textile standards, but lack of third-party testing means this cannot be independently verified.
Source: FDA ↗The full breakdown
What it's made of and why it matters
Casper's Cal King protector is a polyester blend with a waterproof and stain-resistant coating of unspecified chemistry. The coating is the functional layer that creates the barrier against liquids, but Casper has not publicly disclosed whether it relies on PFAS-based chemistry (like Teflon-type coating) or alternative water-repellent compounds. Polyester itself is stable when used as apparel or bedding, but the coating's durability and potential leachables during washing or contact with skin are the main unknowns here.
The brand's record and disclosure
Casper has not published detailed material safety data sheets, certifications (such as OEKO-TEX or similar), or explicit PFAS-free claims for this product line. The brand has not faced major public recalls tied to mattress protectors, but its silence on coating chemistry mirrors a broader industry pattern of opacity around water-repellent treatments in bedding. Without third-party certification or manufacturer disclosure, you cannot verify whether PFAS are present or absent.
How it compares in its category
Most mattress protectors on the market use either PFAS-based coatings (most common, cheapest) or polyurethane-based alternatives (higher cost, often certified). Casper's lack of transparency puts it in the middle-risk zone: it is a recognized brand with quality reputation, but it offers less disclosure than competitors that explicitly market PFAS-free formulations (such as Helix or certain organic-certified alternatives). The waterproof performance is likely solid, but at the cost of unknown chemical exposure.
If you buy it
Wash in cool water and avoid high heat drying, which can degrade coatings and potentially release volatiles. Do not dry clean. Replace every 2 to 3 years or if the waterproof layer begins to peel, flake, or lose water resistance, as aged coatings may leach compounds into bedding. Store in a dry place to prevent mold growth under the protector. If you have chemical sensitivities or are pregnant/have young children, consider requesting Casper's full material declaration before purchasing, or choose a brand with published PFAS-free certification.
What we don’t know
- Basis
- Model estimate, 35% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Casper has made none
Formulations change between production runs, so check the current label. How we grade.
Safer alternatives in Mattress Protectors
Helix
Premium Mattress Topper
polyurethane foam, polyester cover
Volatile Organic Compounds (VOC) off-gassing from polyurethane foam
Limited concern
Polyester cover degradation and microfiber shedding
Limited concern
Polyurethane foam degradation and chemical leaching with age
Limited concern
Water-resistant coating composition (undisclosed)
Limited concern
Lower PFAS risk, though contact Helix directly for water-resistant coating details they don't disclose.
⚠Risky category by default
Casper
Sleep Comfy Mattress Topper
Polyurethane foam, cotton/polyester blend cover
Volatile Organic Compound (VOC) off-gassing
Limited concern
Polyurethane foam degradation and particle shedding
Limited concern
Dust mite and mold colonization
Limited concern
Lower PFAS concern for standard foam topper with no known water-repellent coating or stain treatment, unless you need verified PFAS-free assurance.
⚠Risky category by default
Purple
Waterproof Quilted Mattress Protector Breathable Bed Cover Fitted Sheet For Bedroom Furniture Protection Cooling Topper Purple
Quilted polyester blend with waterproof/breathable coating (unspecified)
PFAS
High concern
Azo dyes in polyester fabric
Limited concern
Microplastics
Limited concern
Coating degradation and leaching with age and heat
Limited concern
Avoid unless Purple discloses coating chemistry, since waterproof mattress protectors commonly use PFAS-based treatments.
⚠Waterproof or stain-proof treatment
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.