I have been down to -11*F with 15-20mph winds in my current setup. I would not suggest going out and getting all new stuff. Try out different systems in your backyard at different temp intervals to see how your stuff works for you. Use what you have right now to learn how it functions in a hammock. Add/subtract/adjust over a few seasons and soon you will learn what YOU need. I spent almost an entire fall/winter in the yard testing my stuff out and now can easily do subzero temps without blinking. Oh, in subzero temps I use pads not an underquilt.