Our EcoWool is the purest thing next to fully certified organic wool. Usually wool that others call certified organic is simply from sheep that are raised organically and it is processed with some additives and often acquires poly fibers in the processing. Our processing is certified organic by Oregon Tilth. Wool in its natural untreated form, protects from bed bugs and dust mites naturally. It is naturally bacteria resistant and breathes even better than cotton. This is our ecowool pillow with organic cotton sateen outer. Hand rinse only.