The Sareer Birch mattress features superior-performance polyester filling, crafted from a sophisticated blend of three high-quality polyester fibers, including an advanced elastomeric binder fiber. With its carefully refined mix of both coarse and fine fibers, the Birch is expertly engineered to provide optimal support and recovery.Rigorous testing confirms the Sareer Birch delivers outstanding performance and durability, maintaining its comfort and support for years to come. The mattress is free from harmful FR chemicals, as the polyester used is inherently flame-retardant.Sustainability is a key focus, as the polyester in this mattress is 100% recyclable at the end of its life and can be upcycled into alternative products, supporting a more eco-friendly lifestyle.A generous layer of memory foam-equivalent material gives the Sareer Birch a medium firmness feel, providing even weight distribution. The memory foam gently moulds to your body, offering targeted support and alleviating pressure point discomfort for a more restful sleep.