Little accidents can happen in bed and when they do it is best to avoid them reaching the mattress itself. This protector is made of 100% polypropylene and is resistant to fluids so stopping them reaching the mattress. Simply change the sheets, wipe the protector dry, re make the bed and everything is back to its hygienic and dry self. What's more it is also flame retardant to BS 7175 for extra peace of mind.