As a former track racer I was suckered in by the name. This jersey is a more traditional style with nylon front but then becomes a lighter mesh around the sides and back. Also the collar is about half the height of a traditional collar but not as low as a "climbers" type jersey. I got a small and while snug in the arms still fits well. I have been known to wear Medium in Sportful and been happy with that fit.
I use this jersey for road riding. I loved the colors and design. Originally, I ordered a small in violet but the shoulders and sleeves were way too tight, though the torso fit fine. I exchanged the top for the seamoss in medium. Again the colors are so beautiful but the shoulder and arm area still felt oddly tight and the torso was now significantly looser. I decided to keep it and have used it too times. Not my favorite because of it but it's tolerable to ride in and I do love the colorway.