My son has several allergies to man made fibres so trying to buy duvets is a bit of a nightmare. Having done a lot of research for natural products I opted for the cot bed duvet from the wool room. A lot of products from other stores claim to be natural but have man made liners in- wool rooms duvet does not. It's absolutely fantastic - so pleased with the duvet and was a really fast delivery as well. My son has had no reactions so this is definitely 100% natural! Well worth every penny. I shall definitely be buying another one when my daughter needs a duvet- cannot recommend highly enough.