Composed of mini-Bonnell Spring units that are encased in an environementally friendly, super-fibre material. Helping to maintain the shape and prolong the lifespan of the mattress. Manufactured in the UK the hygienic and anti-allergenic cover is breathable and moisture resistant, which can be wiped clean and removed for washing purposes. Air is able to pass through the material of the mattress, helping to reduce perspiration and providing your baby with a more comfortable and undisturbed sleep. The mattress protector is made out of a specialist Corovin breathable membrane and covers over one-third of the mattress (70cm wide x 50cm long).