The ideal choice if you think your baby might suffer from allergies or asthma, this 4 tog Micro-Fresh treated cotbed duvet is light, machine washable at 40°C and can be easily tumble dried. Micro Fresh technology helps to keep your baby's bedding stay fresher for longer. The active ingredients in Micro-Fresh inhibit the spread and growth of bacteria by up to 99.99% and remain active wash after wash. It uses materials naturally occurring in our environment that are kind to human skin.