I was about midway on my commute this morning when I noticed that my back was getting a little toasty...which was okay by me since it was otherwise down in the 30's. Just for grins, I arched my back the tiniest little bit. I could feel the air circulating all the way across my back and shoulders. I actually thought about threads like these and grinned.

I have been using a Pearl Izumi Velocipak this season and have no complaints.