Am I safe in assuming that your DH can't wear wool?
Can he wear alpaca? I think that would be a good substitute. My daughter can't wear alpaca, but can wear merino wool, like Malagrigo. So maybe your DH can wear one and not the other, too.
Another suggestion! Encore Worsted by Plymouth is 25%wool/75%acrylic. HERE is a link to Patternworks, an online store that I do business with, and they have ENCORE WORSTED in solids and variegated. Nice yardage, afforadably priced.
The reason wool is good in cold weather: even if wet, it keeps you warm. It feeds your body heat back to you.
Of course, nothing is complete armor against hypothermia if you become lost in freezing weather for an extended period of time.
My husband's brother is a mountaineer (and a Washington State Search & Rescue volunteer). He always wears wool everything when out in the elements. The mountaineers won't even take you with them on a hike or trip if you are not wearing wool, it's that essential.