Rayon.Super Absorbent: Material of 4 Layers,high density inner layer and breathable PUL, no leak through or smell.The soft material provides a comfortable environment for puppies, and the upper absorbent material quickly absorbs pet urine.keep puppies dry all the night..Anti-Slip Bottom - There are a deal of anti-slip silica gels on the bottom side of the fabric. The leak-proof, slip resistant backing will help keep your floors dry while staying in place..Reusable&Washable:Guaranteed absorbency for up to 300+ washes, which is fully machine washable and can be reused many time,No odor left and can go in the dryer.NOTE: DO NOT USE fabric softener, bleach or dry clean these reusable pee pads.Multipurpose - Reusable extra large - 72" x 72"dog potty pet training pads , use in dog kennel & dog crates for large dogs, training puppies pee in playpen or assisting incontinence elderly,as whelping pads & incontinence bed pads & floor mat for pets. They are ideal for protecting carpet,wood floor,furniture,sofa,car seats during travel.