Cal King Mattress Protector vs Premium Mattress Topper: which is safer?

Where these two actually differ

• We flag PFAS in waterproof coating, Coating degradation and leachables over time, Formaldehyde resins in polyester blend or coating and Microplastics or fiber shedding on the Casper and not on the Helix.
• We flag Volatile Organic Compounds (VOC) off-gassing from polyurethane foam, Polyester cover degradation and microfiber shedding, Polyurethane foam degradation and chemical leaching with age and Water-resistant coating composition (undisclosed) on the Helix and not on the Casper.
• The Casper is Polyester blend with waterproof/stain-resistant coating (unspecified chemistry) where the Helix is polyurethane foam, polyester cover, which is most of the difference in these two grades.
• The gap is 45 points, wide enough that this is not a close call, and the Helix is the one to buy.
• We are less certain about the Casper grade, at 35% confidence against 72%, because it discloses less.