I will preface this by saying that I am not a big fan of Castelli clothing in general.
That being said, the Gabba is a super piece for training gear. With a base layer, it works down to at least 40 degrees. Good race fit (I'm 5'11", 40 chest,32 waist, Size L). It's waterproof enough for me. I also own the short sleeved version in black. Reasonable price for what you get.