V-neck collars on cycling jerseys are less common than crew necks, but they can be a great choice if you tend to overheat or find traditional close-fitting collars feel restrictive around your neck. The V-shaped opening allows more airflow to your chest and neck, which can make a real difference on hot summer rides.
The trade-off is less sun protection on your neck, since the V opening leaves more skin exposed. If you burn easily or ride in intense sun, you'll want to be diligent about sunscreen on that area. V-necks also lean toward a more casual look compared to the sleek, traditional aesthetic of most road jerseys.
Consider a V-neck if you primarily ride in warm weather and prioritize ventilation over neck coverage. For most riders, a standard crew neck or a collar with a zip garage is the more versatile everyday choice.