Back in the day, Under Armour took poly base layers and outerwear for hunters to another level, and now they want to do the same thing with wool. Its new threadborne wool is a proprietary wool/synthetic blend that they say has all the warmth and antimicrobial properties of the natural fiber with better stretch and water resistance. Available in Ridge Reaper Barren, UA Forrest Camo and Realtree Xtra.