Abstract: Disclosed is an elastic layer for a mattress structure designed for the comfort of animals in a breeding enclosure, the mattress structure being intended to cover the ground of a receiving area. This elastic layer includes a top face capable of undergoing elastic deformation and that includes a location on which an animal is intended to be supported. The elastic layer is delimited by borders, at least one border being a fastening band intended to receive a structure securing the receiving area with the ground. The fastening band is formed by a lip, the thickness of which is less than the thickness of the elastic layer. Such a structure of the fastening band allows the securing component to be installed at the lip. The securing component can then be protected and covered by the lip, so as to prevent direct contact with the animals.