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You may have noticed that Castelli has a very large line of clothes. If you look closely, you’ll also notice there isn’t all that much repetition within the lines. Some jerseys are designed to focus on aerodynamics, some are meant to be super light for summer; the Castelli GPM Full Zip Short Sleeve Jersey has a more utilitarian bent that will make it perfect for unseasonally warm days or those days you are riding up and down the mountains, in and out different temperature regions.

Though we’re not usually friends of acronyms, we are actually quite grateful that Castelli has chosen to call this jersey the GPM since its full name, the Gran Premio delle Montagne, is a bit difficult to say while riding at a full clip and your riding buddy has asked you what jersey you are wearing. So then, as this is Castelli’s designated “King of the Mountains” jersey, it should come as no surprise that it is amazing at helping you regulate your body temperature. That’s due to the use of Castelli’s Stratus with Prosecco fabric. It is a dual-layer polyester that has an inner multifilament layer perfect for transporting moisture to the microfiber outer layer where it will immediately evaporate. And the A-Number 1 rule for staying comfortable, especially when climbing in the high mountains, is to stay as dry as possible on the way up so that you won’t be a frozen, shivering mess on the way down.

Many other aspects of this jersey work to keep you comfortable and safe. The microfiber collar and sleeves will feel soft against your skin while they work to help ventilate your hot bits. The full-length YKK camlock zipper is so easy to work with, you’ll never have to worry about fiddling with a zipper again. Zip up, zip down, unzip or completely zip up with equal ease. For those long days in the saddle when you may not pass too many convenience stores, Castelli has incorporated three big pockets and a separate zippered pocket for essentials like your keys. So don’t worry, you can stuff a rain cape, power gels, CO2 cartridges, I.D.s and even a pepper spray without having to worry about reaching capacity. Two reflective tabs on the rear will help alert drivers to your presence in low light or in tunnels.

With a handsomely embossed tone-on-tone scorpion on the left shoulder, you can feel confident in the styling of this mountain-goat’s ideal jersey. The Castelli GPM Full Zip Short Sleeve Jersey comes in Acid Green and you’ll find sizes ranging from Small to XXX-Large.

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