Castelli GPM Full-Zip Long Sleeve Jersey

I live in Massachusetts so the winters are pretty intense. I searched the site for a thermal jersey and only Louis Garneau has long sleeve jerseys that are labeled as "thermal". Castelli's Warmer fabric is Castellis warmest fabric evidently and IS thermal. Under 40 degrees you'll need a windproof shell but this jersey performs very well at keeping you insulated. Don't jump up too many sizes because the thermal fabric needs to be in close contact with your skin. I'm 6'3 230lbs. and wear an XL.

This jersey has a great fit when you finally settle on the right size. The sizing chart suggested I was within the margins of a medium. It arrived and was way too small. The large fits me perfectly. So take the recommendation of going up a size seriously. I'm a medium in American sizes and a large in Euro sizes. That has been consistent across a number of brands, including Castelli, whether it's a bib short, jersey or jacket. The fit of this jersey is trim but comfortable. The neck and cuffs fit snug and keep out drafts. It has a nice soft feel due to the fleece inside. Very comfortable to cycle in when it gets down below 60, say. Generally, Castelli's weakest element of their garments are their zippers. This one works well so far, but it doesn't appear to have gotten any special attention from the Design Dept. I got the cool superman blue with red trim. A relatively understated design for Castelli, which I like. One of the few jersey's of theirs I feel comfortable wearing in public.

Jersey feels warm and comfortable. XL fits well (6ft tall), but I wish it were a bit more form-fitted. The quality of the stitching seemed bad at first glance, but so far it is holding up.

Love this jersey! The inside seems to have a light fleece that I really like. When I wear a long sleeve jersey I like it a little warmer. This jersey is it! Quality logos, zipper and the colors are eye catchers.

Fits great. Good for my lanky body. Just order a size up like everyone is saying. I got the booger green one. You'd have to be drunk AND retarded to hit me on the road. It's simple but has enough small detail to not be completely bland. Warm enough for Southern California cold.

My pull-tab broke, too...I had to MacGyver a new one! Castelli needs to change zippers on this jersey.
As well,you have to be slim to wear Castelli stuff. We (North Americans) are not used to wearing tight fitting apparel like this. When you order up a size, the length of the body and sleeves become too long. A pro rider like Heinrich Haussler (who wears Castelli) is a medium in jersey and bibs. He is 5'10" and 160lbs.

I bought these and RMA'd them after deciding I wasn't crazy about the zipper and the jersey itself. I purchased the large ones in red. The zipper construction seemed cheap and wasn't solid like I've seen and felt in other products including Castelli.

As for the fit, Im 5'10", 155lbs, 32-33" waist with an arm length of 32/33. They seemed to be a bit long in the arms. I believe they would offer plenty of arm coverage for when you're hammering in the drops. The fleece material inside seems really comfortable and the jersey otherwise felt snug.

Just because I wasn't crazy about it doesn't mean you will be too. I love Castelli products but this one just wasn't for me. Hope this helps.