A mattress with an adjustable sleeping surface depending on the age of the child. It is made up of two sleeping sides.-1st age side: the first sleeping side is made of foam with a density of 16 kg/m³ for babies weighing up to 10 kg.-2nd age side: the second sleeping side is in microperforated latex with a density of 65 kg/m³ for babies who weigh more than 10 kg.-The Evolutif Fresh mattress is made up of a ticking made of 66% polyester and 34% Tencel Lyocell. Tencel, also called Lyocell, is a half-natural, half-synthetic material. This fabric is produced from wood pulp and a non-toxic solvent. It is a breathable, durable fabric that is as soft as silk, hence its name vegetable silk.-Baby mattress 70x140cm-Soft, breathable fabric-Feeling fresh in summer-Warm feeling in winter-Thermoregulating ticking (34% Tencel)-2 sleeping sides-Convertible bedding according to the age of the child-Face +10kg latex foam plate (2cm) with density of 85kg/m³-Face -10kg polyurethane foam with density 16kg/m³-Firm bedding (65%), Thickness 12cm-Without treatment-Made in France-5 year warranty