I bought the 'super light' duvet to try combating overheating at night in bed but it did nothing to help my situation. In fact I was warmer than usual and had to revert to my 4.5tog manmade duvet after 3 bad nights sleep. As I hadn't purchased a whole 'set', the company would not accept a return under their '30 day guarantee' and as it had been 'tried' they would not refund. I already have a 'natural' mattress and use pure cotton bedding, I even use air conditioning in the bedroom, so everything was stacked in favour of the wool duvet. Obviously I may be able to make use of it in the autumn but I didn't need another duvet for then and I still need to find something for high summer! So, no it doesn't work for everyone. N.B. Eventually the company did offer to collect the duvet and check it had the correct amount of filling in for the range. But worn down from trying to get my point over - I didn't do this, I've put it down to a purchase gone wrong.