Our baby dry sheet mat is Azo free, Azo dyes are one of the main types of dye used by the textile industry. They are known to be potential carcinogens. They were first regulated in the EU by Germany and the list is commonly called the "German banned dye list". If a product has not been made containing these compounds, it is sometimes called "azo free". Wicking Finish (Our Baby dry sheet mat has the Best wicking quality after 25 washes also) Breathable dry sheet mat