This pillow is very comfortable and the cooling effect is very nice. However, it cannot be contained by any normal pillowcase. The material on the outside of the pillow is so slick that the pillow literally shoots out of the case throughout the night. It knocked my bedside lamp over well I was sleeping, and I woke up holding an empty pillow case. I'm going to try putting it in a zip-up pillow cover but I'm not looking forward to spending more money to be able to use something that was already quite an investment.