This has been the absolute perfect Bay Area piece of equipment. I was always a little too cold or a little too warm. As well as a little too loud on downhills. The fit is perfect, the thickness is perfect, and the ability to zip up or down on climbs and downhills is proving to be an incredible feature!
After 1 test ride (3 hrs), these worked great! I was a little worried about sizing but the mediums have been great for me (for context, I'm 6', 155lb, and have relatively lean arms for my body type). They fit snugly but didn't cut circulation off, and kept me warm on a ride into the Colorado foothills (and back down) on a cold, windy Saturday in March. Looking forward to putting them to more use, but so far, so good!
Fits great, I have skinny-as-**** arms and these stay up right where they are supposed to. Warm and breathable too.
The arm warmers are very warm and cozy. But they are definitley on the tight side. I got them for my brother who is 5'10" and has larger than average arms. He says they are super warm but that they are so tight that his wrist sometimes hurts. I got him a size Large, so he'd probably be okay with the XL. I know it's a tough balance because if they are loose they will slide down. So I just probalby needed one size larger for him. Overall, they are super warm and great quality and I will probably get myself a pair too.