For my sub-zero long runs, I only do one tech long-sleeve top, short sleeve tech on top of that, and fleece sweater turtleneck above that. Tech-short-shorts (no underwear) and then tech pants above that. And that's all I need for core. After that, the key things are then ear and hand protection. I do 2 to 3 layers for the ears/head (usually 0-degF is my benchmark for adding … [Read more...]