Everything will bunch some, unless you raid Steve Jobs wardrobe and snag some turtle necks. That said, I have a Phunkshun 2L tube and a Celtek Payson for the hot days. I wear the Phunkshun for warmth and cause I don't like sunscreen on my neck. Which is why I also have the Celtek. Cause it's not warm, but still covers my neck.
Go ahead, drink that kool-aid.
FS: Forum Sauce 142 $200 plus shipping
FS: Flux SE30 $75 plus shipping