Originally Posted by Eric F

My reasons...
- Rear pockets for storage of phone, tools, and snacks (this is essential for me - I don't like bags on my bike)
- Snug fit that doesn't allow the fabric to flap, AND keeps the stuff on the pockets from moving around (I have a jersey that is a little too large for me and the rear pockets droop and shift - highly annoying)
- Lightweight fabric that wicks sweat efficiently, and ventilates well in the areas that benefit most from ventilation.
- Fabric texture that is comfortable and non-irritating against my skin.
- Full-length zipper for ventilation and easier on/off.
- Pleasing design and colors (totally subjective) or club kit.