Look into Armadas mitten selection. I have a pair that are a few years old and they are awesome. Lightweight and feel like nothing, but still super warm. They survived tow ropes for the most part too! Go armada...just my 2 cents
Maybe I wondered that wrong by lightweight and meant a glove for warmer days have a pair of Hestras for when it's cold but if he gets above like 25 my hands start to cook.