Waterproof Downright Mattress Protector vs Premium Mattress Topper: which is safer?

Where these two actually differ

• We flag PFAS in waterproof coating (fluorinated compounds), Coating degradation and microfiber release and Volatilization of coating components (VOCs/off-gassing) on the Brooklinen 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 Brooklinen.
• The Brooklinen is Polyester/cotton blend with waterproof coating (composition unspecified) 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 Brooklinen grade, at 35% confidence against 72%, because it discloses less.