Sofzsleep's pure natural latex baby COT mattress is designed to help your child sleep comfortably and cool during the night. Their baby mattress is certified to be toxic-free from formaldehydes, pesticides, PDBEs (Polybrominated Diphenyl Ethers – chemical flame retardants) and other toxic chemicals. A testament to stringent cleanliness and hygiene standards, Sofzsleep's baby COT mattresses comply with the Oeko-Tex® Standard 100, ensuring that there is no off-gassing of noxious fumes. Sofzsleep pure natural latex baby mattresses have millions of microscopic open cells that makes them ventilating and cooling to sleep on. *The density of Sofzsleep's cot mattress is 85 kg/m3 which is considered firm and offers the right support while not compromising the comfort for a baby. Their latex mattresses are manufactured in Belgium and they don’t add fillers (calcium carbonate) in their latex which makes the latex very hard and the latex becomes “chalky” in a very short period of time. Their cot mattress cover is made of Bamboo and polyester (for washability). Bamboo possesses a uniquely natural property that prevents and resists infestation by fungi and harmful bacteria. It always feels cool with its highly ventilating properties.