Adaptive Phase Change fabrics are now included as a feature on all Love Bed, Alexander Signature Series and Alexander Hybrid mattresses. Adaptive, as explained in the video above will help you sleep cooler and more comfortably. This material is now standard and there is no increase in the price of our beds. You will not find phase change fabrics on many mattresses on the market. Nest Bedding is consistently working to make our beds better and a better value.