"wore mine running this morning as a base layer under a windshirt, temp 19F w/ 15-20mph winds and I was just right- w/ the R1 I would have been overly warm and getting wet"
I've been using the Cap 4 Hoody a lot this winter and have found it to be far more versatile than the R1 Hoody. I've found it to be comfortable in a range from ~45 degrees down to ~30 with winds up to ~15 mph when I'm on the move and working hard; it's tolerable down to the mid 20's with lighter winds and up to ~50 degrees on the high end, especially if there's a decent breeze. In higher winds or lower temps, I go straight to a Rab Boreas windshirt, beginning in the mid to high 30's. Above 50 degrees, it is time to go to a lighter baselayer. The R1 is good on the low end of this range, but does not move moisture nearly as well, and is unusable above ~45 degrees when on the move. All this is IME. YMMV. All in all, the most versatile base layer I've ever used.