Too warm in the Summer

We bought the iComfort Insight because of the claims that it will sleep cooler than other memory foam mattresses. It was fine during the fall and winter when we bought it, but as soon as summer came. We found that it slept much warmer than are conventional mattress did. As far as the comfort is concern. The first week I thought it was the greatest mattress that I had ever slept on. Then I started to notice that I would be slowing sinking deeper into the mattress during the night. This sinking into the mattress made it a lot harder to roll over and to get out of the bed. This mattress might be OK if you weigh 100lbs or less and like it warm in the summer, but to anyone else, I can not recommend buying it.