The Velocio Alpha Long Sleeve is an insulated cycling midlayer that slides under a shell or vest and carries a lightweight outer piece into freezing temperatures. Polartec Alpha Direct insulation covers the front, and merino wool mesh on the back and sides keeps the cut slim. What Our Gearhead(R) Experts Are Saying:"On cold climbs, the insulation up front lets air through and wicks moisture while I'm working hard. The moment I ease off at the top, it traps heat. That swing is why one shell and this layer cover my whole ride."