It ticks all the boxes: waterproof, hypoallergenic, breathable, noiseless and fits perfectly to the shape of your mattress. This SafeRest product is really the whole package when it comes to buying a reasonably priced mattress protector. Is the SafeRest Premium Hypoallergenic Waterproof Mattress Protector a good buy? Our only niggle is that it’s not waterproof on the sides. This mattress protector is the number one bestseller in its field on Amazon and it’s easy to see why: it’s comfortable, silent, waterproof, hypoallergenic and suitable for all the family.