well in a general all terrain setting of snow/scree/forest etc, i have a good outer shell waterproof windproof pants that have a stretch at the bottems so hugs my legs/boots
also my boots come 1ft up my leg and are great waterproof tramping/all terrain boots
are gaiters needed really?
an extra 21grams, but im worried snow/long grass etc will find its way up under my outer pants and get my socks/layers wet :/

