Brooklyn Bedding Mattress Encasements vs Premium Mattress Topper: which is safer?

Where these two actually differ

• We flag Fluorochemical coating (PFAS family), Coating degradation and chemical release and Lack of third-party certification and transparency 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 with waterproof/moisture-barrier coating (type 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 42% confidence against 72%, because it discloses less.