NanoGuard is a material with surface protection. LILLIBED uses it for dogs that have got problems with incontinence or for their puppies. In case of the cover being soiled in this way, you only have to wash the outer design cover. The special NANOGUARD protection cover only needs to be wiped off with a damp cloth and is ready for use again immediately. The urea cannot get through to the mattress due to the NANOGUARD protection cover. This means that the mattress is hygienically clean and dry at all times.