Soft, airy comfort, whatever the season. Both duvets in the Hybrid™ 3-in-1 design keep you comfortable, whatever the temperature. Apart, they’re a light 3.5 Tog Summer duvet, and a thicker 7 Tog Spring/Autumn duvet; together, they make a luxurious 10.5 Tog Winter one for colder nights. Snap or detach depending on the season, and enjoy even coverage and quick, easy drying from our square-stitched, clump-free design.Simba Renew™ is the airy filler in both duvets of the seasonal bedtime essential. Soft and down-like, it’s made from recycled PET bottle fibres combed into light, clusters, which are designed to offer gentle warmth; it's then blended with 20% modal to encourage fresher airflow.On one side of each of the duvets you’ll find world-first, thermoregulating Stratos tech. Up to 3°C cooler than non-treated fabric , it's cool to the touch, prevents the build up of heat and evaporates moisture for drier, more comfortable sleep at the perfect temperature.