BORN TO KEEP YOU FROM FRUSTRATION Super Waterproof Mattress Protector 200% Weterproof:Block Every Last Drop. 1 Thickness Of Waterproofing?20?m. 2 Waterproofing Lifepan?Over 500 Wash Cycles. SAFE MATERIAL:SAFETY ALWAYS COMES FIRST. Made of 40% Bamboo Charcoal + Fiber 60% Polyester(O Vinyl 0 Benzene). BREATHABLE & COOLING:LET AIR FLOW. The advanced 3D air mesh design allows the air to circulate freely and prevents over-heating when you sleep directly on it. STRETCHY & DURABLE: The blend polyster has shown better performance in flexibilty and strength than cotton terry vinyl or other common material which could withstand the tear pull or roll in decades of daily use.