Start your layering off right with the Men's Rock'N'Wool Long Pant from Ortovox. These colorful baselayers start with a midweight merino wool for comfort and warmth. Luckily, merino wool is naturally anti-microbial as well, so these will work wonderfully for long days followed by a trip to the bar, or for even longer expeditions where you might not have regular access to any sort of washing machine. Form-fitting as they are, these long underwear bottoms will layer easily under your shell or outer layer of choice.