For seemingly forever, layering systems have been an integral part of our sporting lives. Back-in-the-day we wore a t-shirt followed by a cotton shirt accompanied by a wool sweater and then a waxed-cotton coat. If the coat was tan, it doubled in a duck blind, and if not it was traded for one with a camo pattern. These natural materials felt great, they worked well, and we were comfortable. Sometimes we got wet, other times we got hot, but usually, we were cold. No one complained for it was part of hunting.