Snowtroopers were elite Stormtroopers who were ready to kick some butt with gear to help handle extreme cold environments. They could set up an E-WEB cannon almost fast enough. Like Sandtroopers, Snowies had backpacks. Only they had heaters in theirs. I mean, I assume so. Would suck if they had air conditioners too, don't you think?
Snowtroopers fought in the Battle Of Hoth and kicked the Rebel Alliance right in the butthole.
Snowtrooper officers had slightly different armor, and a full helmet. The Snowtrooper officers were really badass.