Made for fine, cool days, the Puro 4 Jersey is warmer than its weight would suggest, reflective for grey days or in case your ride runs long, and stretchy enough to offer a close and flattering fit, without ever feeling restrictive. It's also very good at wicking sweat.
The 180g fabric punches above its weight due to its 3D knit, which traps air inside and warms it as you ride. It is still breathable enough to manage moisture with aplomb, though, while high stretch ensures it's very comfortable to wear.