Your body is designed to sleep in a climactic rhythm defined by nature. And the ChiliSleep OOLER advanced sleep system supports this rhythm. Letting you sleep as nature intended, this luxurious sleep system complements your circadian rhythm. In fact, the OOLER sleep system uses temperature technology to signal and maintain sleep. You’ll re-align with your ancestral sleeping style using this cooling mattress pad. Unlike fans and wicking fabrics, this device lets you sleep when it’s colder and darker. Then, it encourages you to wake when it’s warmer and brighter. Providing active and dynamic thermal change, this advanced sleep system has a hydro-powered thermal range that operates from 55º F to 115°F, which is 13º C to 46°C. Along with the OOLER itself, the setup includes the reversible Chili Cool Mesh™ pad, ergonomic control units, and the OOLER app for a truly customized sleep experience.