Nexgen Waterproof Fitted Mattress Protector vs Vintage Linen Bed Cover: which is safer?

Where these two actually differ

• We flag Waterproof coating off-gassing (VOCs/unknown chemicals), Flame retardant treatment (if present), Microplastic shedding from coating degradation and Allergic contact dermatitis from coating residues or dyes on the Mainstays and not on the Parachute.
• We flag Azo dyes or heavy metal pigments, VOC off-gassing or odor and Mildew or mold growth if damp on the Parachute and not on the Mainstays.
• The Mainstays is Polyester fabric with waterproof coating (type unspecified) where the Parachute is 100% linen, no reported coating, 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 Parachute is the one to buy.
• We are less certain about the Mainstays grade, at 35% confidence against 82%, because it discloses less.