In addition to all the natural and organic materials, great features, and safety and sustainability certifications in the Birch Natural Mattress, the upgraded Birch Luxe Natural Mattress features organic cashmere, 2 additional organic comfort layers, breathable natural latex, lumbar support for enhanced contouring, perimeter support, a plush quilted mattress top, a soft and breathable cotton cover, and even more eco-responsible production credentials.