With the rest assured northington 2000 pocket natural mattress you can feel the benefits of improved sleep this handmade pocket sprung mattress is designed to contour your back while still offering extra support the luxurious cashmere pure wool and silk filling keeps you warm in winter whilst still managing to keep you cool in the summer the mattress also has a soft woven cotton and yarn sleeping surface additional air vents in the mattress allow air to circulate freelyplease note spring