So, I'm menopausal, have night sweats and hot flashes throughout the day. Awesome during a hot humid summer, right? Not at all. I was so freakin' hot a couple of weeks ago, I started searching Amazon for cooling sheets. I found a half a dozen sets, read their reviews and it came down to Peru Pima temperature and another brand. Peru Pima was double the price of the other set but the reviews for Peru Pima told me that they felt like hotel sheets, which are cool and crisp, as opposed to a much softer sateen sheet. I wanted my bed to feel like a hotel bed, so I bit the bullet and bought the Peru Pima temperature sheets and an extra set of pillow cases. I washed them and put them on my bed the moment they were delivered. That night, I slept better than I had slept in years. The sheets were cool when I climbed into bed and remained cool throughout the night, not that I noticed because I was out like a light. My husband, who hasn't slept in the same bed with me since I started having night sweats, crawled into bed with me on day 2 of the sheets and now he wants a set for the guest room, where he's been sleeping. I just ordered a second set for my youngest son, who is a hot sleeper, and I cannot wait for him to try them out. I've had these sheets for about a week and I won't use any other sheets in the summertime. One thing to keep in mind though, these are not super soft sheets. They are crisp. If you want super soft sheets, these are not for you. If you want a crisp, cool percale, buy these, right now!