Heavier than a jersey, lighter than a jacket - it's a jerzacket! Silky smooth with a cryptic symbol on the chest that will make you feel like a goddamn superhero or cult leader. Throngs of fervent admirers included.
 
Featuring proprietary "If it zips, it fits" technology, this jersey runs approximately 1/3 size small relative to the Platonic ideal of jersey fit. If you're carrying some winter hibernation stores or want to wear a thicker (particularly long sleeve) baselayer, size up. Model is 5'11", 150-ish lbs and is wearing a Small at the very limit of its capacity because he is stubborn and vain.