Harrison Spinks Byron Mattress - UK Emperor

• Top surface. Generously layered with 100% natural cashmere, mohair, cotton, hemp, flax and British wool. This is the winter side, where insulating wool with silk absorbs moisture and helps regulate temperature, which means fewer clammy nights in colder months.
• Fillings. Soft cashmere, sourced as a byproduct from the fashion industry, brings insulation and a supremely gentle surface feel. It sits alongside traceable British sheep's wool from the British Wool partnership.
• Springs. 13,060 responsive springs across seven layers of high-density micro and Cortec pocket springs, which means very precise, localised support. The Cortec system is glueless and 100% recyclable.
• Reverse surface. A breathable cotton side designed for summer use. Flip the mattress with the seasons to get the right sleeping temperature year round.

Layer details from featherandblack.com product page, September 2026.