Each mattress within The Ultimate Collection is hypoallergenic and houses innovative high-density springs to truly respond and support your body. Hand made with luxury natural fillings, these truly breathable mattresses enable your body temperature to self-regulate more effectively. With rows of hand side stitching, they have been designed to provide you with the perfect night's sleep. Featuring 28000 springs in the king size model, this mattress contains high-density 4K pocket springs which effectively map the contours of your body while you sleep, relieving pressure for a supremely comfortable experience. A core of Revolution springs sit in natural pockets to allow air to pass through freely for enhanced breathability, whilst also providing a central support system. In addition to its wealth of natural fillings, the mattress includes alpaca wool which is even warmer and more luxurious than sheep's wool. It has a soft and springy feel, is naturally fire retardant and can be blended with other natural fibres to make incredibly sumptuous filling layers that are both soft and durable. With a warm wool side for winter and a cool cotton side for summer, simply turn the mattress over with the seasons to experience tailored year-round comfort. The mattress' luxurious fillings and spring systems are held together with 5 rows of hand side stitching, as well as hand tufted wool rosettes for a durable, long-lasting finish. 16 vents ensure effective air flow, to keep your sleep surface hygienically clean and fresh. The zip link offers you the flexibility to have one big mattress or two independent mattresses depending on your needs. And as each mattress is individually made, you will eliminate any roll together. Alternative mattress tensions are available in store. Please call your nearest John Lewis to check before you visit. Please note: The Mohair used in our mattresses is ethically sourced from Angora goats. Our supplier, from South Africa, is a member of the South African Mohair Growers' Association and is committed to providing the best possible conditions for animals. Each goat produces between four and five kilograms of Mohair annually and is shorn twice a year in a humane manner. Extend the life of your new mattress with a durable and breathable mattress protector.