We revel in the lines our jerseys leave on our biceps. It speaks of our devotion to our metier. But you might prefer the tan lines on your arms to be a little less obvious. If you want your arms to look evenly sun-kissed, go with Castelli's GPM Full Zip Sleeveless Jersey. It has all the features of their short-sleeved GPM jersey, just with finished holes for your arms rather than a sleeve of any kind.
Both GPM Jerseys are made of Stratus fabric with Prosecco treatment. The collar and arm holes are topped with seamless micro fiber fabric for comfort and grip. There's a silicone gripper at the waist hem. The jersey also has a full-length zipper with a cam-lock on the pull. Open up the zipper and you can pull open the jersey without tugging on the zipper. Lock down the cam, and the pull will stay in place.
Castelli's Stratus fabric with Prosecco treatment looks simple. But the engineering behind it is impressive. Stratus is a dual-layer 100% polyester knit weave. The inner layer is a multifilament web that moves moisture from your skin or base layer to the outside of the fabric. The outer layer is a micro fiber weave that allows the sweat to evaporate in the wind. Prosecco is a treatment that helps water disperse and evaporate faster, rather than staying in the jersey.
The Castelli GPM Full Zip Sleeveless Jersey comes in Black, Cyan, Red, and White. Sizes run from Small to XX-Large. There are three rear pockets with the Castelli scorpion on the middle pocket and a fourth, mini-zip pocket built into the right rear pocket. The Castelli logo is also on the shoulder.