Thermarest Tech Blanket Use it alone for on-the-spot comfort, or mate it directly with your Therm-a-Rest mattress to create a complete sleep system Use it alone for on-the-spot comfort, or mate it directly with your Therm-a-Rest mattress to create a complete sleep system Use it alone for on-the-spot comfort, or mate it directly with your Therm-a-Rest mattress to create a complete sleep system