I rang the Onkaparinga Blanket factory in Albury Wodonga, they have these little 100% wool naturally repellent underblankets - perfect size for a bassinet/cot or you can use two on a single bed. They are like a thick woven wool blanket and quite breathable. I personally wouldn't use anything else now I know about these (Just can't remember what they are called, but the shop person will know what you're talking about when you ring).