When making the Relyon Lisieux Mattress, no detail has been overlooked. To ensure that the sleeper is kept at their perfect, personal sleeping temperature, craftsmen have added a layer of breathable cotton, which is well known for its thermal regulation and moisture-wicking qualities. In addition, the three rows of stitching on the sides of the mattress have been completed by hand, helping to reinforce the mattress and ensure it retains its shape and firmness. This is further enhanced by hand-tufted wool tufting, designed to keep the fillings secure and evenly distributed.For safety purposes, the mattress has been treated with a chemical-free and environmentally friendly fire retardant. There are three spring tensions to choose from, so you can tailor the Relyon Lisieux Mattress to your sleeping needs.The benefits of pocket springs are well-documented. Each spring is housed in a fabric pocket, facilitating independent movement and supremely responsive support. The Relyon Lisieux Mattress mattress takes this one step further, boasting two layers of pocket springs, each individually nested and tied by hand for the ultimate in supportive comfort. This process gives the springs a greater level of flexibility, allowing them to respond with comfortable precision to the contours of the body. In addition, because there are 2000 pocket springs in the mattress, the levels of motion transfer are significantly reduced, even if you sleep next to someone who is prone to the odd late-night wriggle!.While many mattresses use a blend of cotton and wool as the layer between the springs and the upholstery, the fibres can drop between the springs and, over time, the mattress can lose its resilience and consistency. The Lisieux solves this problem by adding hair fibres into the mix. These create a natural matrix that keeps the other materials in place, prolonging the shape, firmness and luxurious quality of this outstanding mattress. In addition, this layer provides an excellent layer of breathable insulation.For those with sensitivities to environmental allergens and dust mites, a layer of hypoallergenic fibres provides a welcome and protective barrier. Before being fitted, the layer is completely sterilised and ensured to be free of dust. In addition to their hypoallergenic properties, the fibres are super soft, providing an additional layer of comfort to an already sumptuous mattress.