This Organic Cotton mattress encasement by Sleep and Beyond is an innovative 100% organic cotton two layer jersey that offers a zippered waterproof solution. This encasement can prolong the life of your bed and protect it from stains, leaks, dust mites and bed bugs all in one! It is fully reversible with a six sided design that offers full mattress protection. Free of vinyl/PVC, phthalates and other harmful chemicals, it is crafted with two layers of soft 100% organic cotton jersey fabric with non-toxic TPU inside to provide waterproofing. Pore size of TPU is 3 micron. Choose the 10 inch option for mattresses 8-12″ or choose the 14″ option for mattresses 12-16 inches.