Mattress protectors made of organic cotton flannel and polyurethane. The protectors are impervious to liquids, but are breathable - permeable to air. The upper side is made of organic cotton flannel, this material is certified by both GOTS and Oeko Tex Standard 100. The bottom is made of polyurethane, which is also certified Oeko Tex Standard 100, so the mattress protector is suitable for babies. We produce in the Czech Republic.