I was skeptical when I bought this. How can a mattress pad help you to sleep cooler? It's not so much that there is a cooling agent involved, it is that there is a barrier between you and the hot mattress. This pad is created for use with memory foam mattresses. If you have a memory foam mattress, you know that they can make you hot on summer evenings. This pad places a cool layer between you and the hot mattress. It really did keep me cooler from the very first night! For the price, it had better work. I would recommend this for others who have a memory foam mattress and are looking for a cool night's sleep.