Yes. Strictly speaking, there's no need for a warmer bag in this part of the country except on very rare occasions (on the order of once or twice per multiples of years), and I'd only go out on those days for the novelty of it, and only if I knew my equipment could handle it. So, the liner part of the equation is really a just in case. If it couldn't also be used as a summer bag, I wouldn't even entertain the idea.