We switched from our previous Millbrook mattress to a memory foam mattress. This was a big mistake. It held the heat so much we had trouble sleeping (even in the winter). So having put up with this for 10 months we decided to go back to Millbrook. Our previous one was over 12 years old and whilst still comfortable we just needed a fresh one. Our decision to go back was money well spent. This Keyhaven is very comfortable and regulates temperature very well. Average weight couple if this helps your decision.