Being a duvet on, duvet off person, who's struggled with being too hot in bed, I thought I'd give this a go. I wasn't convinced it would work, but thought I'd send it back if not. But, I've been really pleased with it. Keeps at a great, even and comfortable temperature. I love that it's firm, but not too much. Doesn't collapse at the sides when you sit on the edge, or make a big dent if I work in bed. Has a nice quality, luxury feel. Would recommend a deeper fitted sheet.