Slumberdown All Seasons 3 in 1 duvet is made up of two separate duvets; one cool 4.5 lower tog duvet and one nice and cosy 10.5 medium tog duvet. When clipped together, they make an extra warm and snuggly either 15 tog duvet. Use the lighter tog for keeping cool on warm summer nights, the medium tog on milder nights and them both together for when you need some extra warmth on cold winter nights. It gently wraps around your contours so it stays with you as you move in the night. It is also lightweight even at high tog counts. It is non allergenic which means there\'s nothing in it that can cause allergies. It is machine washable at 40 Celsius and can be put in the tumble dryer. Made in the UK.