Organic Cotton Mattress Cover and Pad Protector vs 3 Gel-Infused Memory Foam Mattress Topper with Washable Cover: which is safer?

Where these two actually differ

• We flag Volatile organic compounds (VOCs) from polyurethane foam off-gassing, Flame retardant chemical disclosure and identity, Formaldehyde in polyester cover or binder resins and Thermal decomposition if heated or exposed to high temperatures on the Sleepyhead and not on the Avocado Green Mattress.
• The Avocado Green Mattress is organic cotton where the Sleepyhead is Polyurethane memory foam + polyester cover, which is most of the difference in these two grades.