The Survival Wool Shirt and Pants is a tight weave structure producing no material with any bunching or balling. The thickness of the wool, plus the added windbreaker liner, is significantly effective for extreme weather and warming layers. The quality of the wool has a natural antibacterial property. This lighter weight wool is perfect for hunters and back country campers. Similar designs are currently being made for the U.S. Military and are All-American Made in the U.S.A.