Today Therm-a-Rest offers three different series. The Fast & Light series provides comfort to go farther. This is the perfect choice for people who see excess as a barrier to success in the outdoors. The mattresses in the Therm-a-Rest Fast & Light series are warmer and lighter than ever before and with the new member NeoAir, Therm-a-Rest has produced the warmest and lightest uninsulated mattress ever. Another series is called Trek & Travel. These are mattresses for those who carry their gear but want more comfort. In Therm-a-Rest Trek & Travel you will find products like Trail Pro and Trail Lite.