Redesigned for 2017 the best warmth to loft ratio of any self inflating backpacking mattress with added warmth for cold sleepers the therm a rest women s trail pro mat is a comfortable and easy to use self inflating backpacking mattress and is now lighter therm a rest added air bolsters to shave precious ounces while keeping the mattress four season warmth the trail pro features their ultralight u s sourced foam saving you weight and space in your pack without any sacrifice in comfort the women