This soft, light duvet works for all seasons with a cover and filling that both actively regulate temperature. The cover uses a ‘phase change material’ called Stratos™, which is applied to the cotton. It reacts to your temperature, absorbing heat when you get warmer and releasing it back to you as you cool down. The cool night fill uses fibres with embedded minerals that dissipate heat away from the body. The sewn pockets create even fill distribution. It is hypoallergenic & machine washable.