Why is a cot mattress protector essential for every baby's cot mattress? Even if your cot mattress is waterproof and washable you should still use a removable waterproof protector, otherwise you cannot be certain how clean the surface really is. Seams and creases can be perfect hiding places for harmful mould, fungus and bacteria and simply wiping a mattress down will often leave them behind. The only safe solution is a removable washable cot mattress protector. Washing at high temperatures leaving nowhere for germs to hide. Order your cot or cot bed mattress protectors today.