What material comprises a mattress liner effective against pests?

Permethrin-impregnated polyester netting is recognized as an effective material for mattress liners intended to combat pests due to its insect-repelling properties. Permethrin is a synthetic chemical that mimics the insecticidal properties of naturally occurring pyrethrins, which are derived from chrysanthemum flowers. This treatment makes the netting effective against a variety of pests, including bed bugs and other insects that may infest mattresses.

Using polyester netting for this purpose has additional benefits, as it is durable, lightweight, and allows for breathability, which can provide comfort while also creating a barrier that deters pests. When a mattress liner is made from this material, it helps protect the mattress from being contaminated, contributing to a healthier sleeping environment.

The other materials listed may not have similar pest-repellent properties or practical applications. For instance, cotton thread does not provide any deterrent against pests, while nylon fabric lacks the insect-repelling treatment that makes permethrin-impregnated netting effective. While plastic sheeting may act as a barrier, it does not have the same insect-repelling chemicals, and can trap moisture, leading to potential mold growth, which is undesirable in bedding contexts.