This Micro-Fresh treated crib mattress protector from John Lewis is the simple way to protect your baby's crib mattress. If you are concerned your baby may suffer from asthma or allergies, this protector is ideal Featuring a soft quilted face, a fitted skirt and a waterproof backing, this Micro-Fresh treated mattress protector washes at 60°C, tumble dries on a low heat and dries quickly letting you easily pop it back on before bedtime. The 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.