The HR polyether layer gives the mattress better adaptability, and the Visco Adapt layer provides ergonomic support for all parts of the body. The Rest Cell foam core provides stable, ergonomic support, ensuring continuous airflow through its alveolar structure. Loira Colchoneta is a flippable mattress without handles, with high firmness and mid-low breathability. All Sema mattresses come with our permanent, effective dust-mite treatment B.A.T. (dust-mite treatment).