The already tight weave got even tighter. It blocked more wind and shed more water. Each washing had revitalized the fabric and left it softer and thicker. It's hard to believe that the same shirt and pants that keeps you warm at 20 degrees below zero will also be comfortable at 60 degrees above zero. The under layer fabric you choose is important.
Every body is different.
Your metabolism, physical condition, style of hunting, acclimatization, and general health are some of the personal characteristics that have to fit into a wide range of weather conditions. Silk is all you need under Omnitherm when conditions are mild and temperatures are above freezing. No fabric feels better against your skin, especially when you are sweating. A natural fiber, silk will absorb moisture but has a low density. That means that when you sweat, silk keeps moisture on your skin to cool you.