While the fabric is GOTS certified organic cotton jersey, the waterproof polyurethane lamination is clearly not organic. However; polyurethane is the cleanest, safest and most durable water barrier available on the market today. It is 100% waterproof, breathable, inert, free of VOCs & PVC, burns clean and does not off gas or leak chemicals. At this time it is impossible to have a 100% organic mattress that is also 100% waterproof and can withstand use and repeated laundering. Wool mattress covers and other similar products are only water resistant and cannot provide 100% waterproof protection. Ultimately, this is a question best answered by your own personal priorities and preferences: 100% organic vs 100% waterproof.