The Sonar Outlast product contains pretty amazing technology, originally designed for NASA. The materials are designed to promote a good night's sleep, as sleep is vital to your health. The materials used in this bedding are designed to absorb, store and release heat, resulting in optimal comfort. They continually regulate your heat during the night, and will help keep reduce sweating. Sonar Outlast can be used year round, and the more product you have from this range, the better your temperature regulation will be. Grab yourself a Cooling Duvet Inner, Cooling Pillow, Cooling Mattress Topper, Cooling Sheets or Electric Blanket (for Winter use).