The Tulip Leander Waterproof Mattress Pad aka the Stinky Pad is an alternative to conventional plasticized crib mattresses and crib mattress protector. Featuring unbleached organic cotton and a medical grade waterproof liner, the Stinky Pad is placed between the sheet and crib mattress to protect your crib mattress. Most crib mattress protectors just use PVC Vinyl for waterproofing which is known to outgas. The Stinky Pad’s medical grade waterproof liner is safer and will last much longer, toughing through countless washes mattress protectors undergo. Hand stitched, the Stinky Pad is composed of 2 layers. First is Essentia’s unbleached organic cotton. Second is the medical grade plastic waterproof liner which also reduces shifting. The Stinky Pad is hypoallergenic and a dust mite deterrent. To clean simply toss in washer and allow it to air dry.