If temperature regulation whilst you rest is a priority, the Ortho Echo is for you. The mattress features a combination of materials that are known to wick moisture away from the body. This helps to prevent the chill of drying perspiration, as well as assists in alleviating the unpleasant dampness of excess perspiration. The washable Egyptian cotton cover ensures a hygienic sleep surface. Wool and English cotton form layers beneath the cover. Wool, in particular, offers optimal temperature control. The cover and natural materials in the mattress have not been chemically treated, resulting in a more environmentally friendly product.