Premium Mattress Topper vs GRUSNARV Waterproof mattress protector: which is safer?

Where these two actually differ

• 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 IKEA.
• We flag Phthalates in polyurethane or polyester blend, Coating degradation and leachable release, Off-gassing from polyurethane or adhesives and Undisclosed waterproofing chemistry (PFAS or alternatives) on the IKEA and not on the Helix.
• The Helix is polyurethane foam, polyester cover where the IKEA is Polyurethane or polyester blend with waterproof coating (composition unspecified), 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 IKEA grade, at 45% confidence against 72%, because it discloses less.