Slip on this ultra warm full-body baselayer and let your cold weather worries vanish. The Smartwool Merino 250 Baselayer One Piece Suit features thumbholes, a close fit hood and a zippered drop tail for easy pit stops and everyday use on the mountain. A 250 weight baselayer is great for activities in colder climates where a little extra warmth beneath your insulating and weather-protecting layers goes a long way towards all-day comfort.