It’s getting chilly here in the middle-west part of the country, and with that comes an increase in the layers of stuff on my outsides whilst I ride.  To this point, I’ve been working with an “all-wool, all the time” model for my upper parts with three layers of varying thicknesses of merino wool for temperatures down to about 25 F. Those of you who don’t know what merino wool is probably don’t have computers and might, in fact, live under rocks. If that’s the case, you won’t read this, so go screw yourself.  But, just in case you’re new…