First Lite Wool's Chama shirt is the perfect layering option for those cold September mornings that turn into 75 degree afternoons.  With the Llano and Chama together you have the ultimate layering combination.  The benefits of First Lite's 100% merino wool are numerous.  Number one for me is the comfort range in which it operates.  Whether the temps is 25 degrees in the morning or 75 in the afternoon I always feel comfortable.  I rarely get that overheating feeling when hiking up a steep mountain and when I do sweat the 100% merino wool dries quickly.  The next great benefit is the ability to be worn for days and not stink.  I wore a Chama for six straight days in the backcountry last year and it still smelt the same on the last day vs: the first.  Lastly the comfort of the Chama Shirt is outstanding, my fiancee wears one as her pajamas.