Brethren say - Waterproof Snowboard Pants, styled on your favourite joggers. The comfiest technical bottom layer available. You might even keep 'em on after the hill.

10k 10k Waterproof and breathable polyester Softshell with bonded soft brushed fleece lining
Velcro’ed, combat style pockets.
Toggle drawstring ankle cuffs.
Zipped up side and back pockets.
Drawstring waistband for adjustable fit.
Waterproof waist gaiter to seal out the wet. Also handy if you like your snowpants sagged low.