The Ascent won't be a warm piece of clothing at all. It's made to stretch and be comfortable. You will be able to layer under it and the stretchability of the Ascent will make it so you can walk without your outer layer binding up. Used by itself, the Ascent is designed for warm-weather and/or active hunting. The Stratus on the other hand is designed for cooler weather, but probably depends on the person whether it's the layer for 25 degrees. Some folks love it, others need more. Either way, you got some gear that should last you a long time and be very functional.