Also, if it's freezing cold I use some really thin silk glove liners (or undergloves, or whatever, small thin gloves that go between your skin and the gloves), a thin lycra OD balaclava and some wool socks..
It's rare to be playing in sub zero temperatures here though, in all my airsoft career it happened only twice but the games were so fast pace and with little to no break in between that we never had the chance to "freeze our asses off"