As a male what can I wear under my jeans when it's really cold.?

Update: So, some back info, I live in New England, and the temps get crazy cold, and I have to walk to school which is about ten mins. The issue I'm having is at times it's like 20F all day. When I wear jeans my legs still get cold and was wondering what I should wear underneath my jeans to keep me warm. Looking... show more So, some back info, I live in New England, and the temps get crazy cold, and I have to walk to school which is about ten mins. The issue I'm having is at times it's like 20F all day. When I wear jeans my legs still get cold and was wondering what I should wear underneath my jeans to keep me warm. Looking for like just things I'm really bad with cloths, and when you recommend, something can you guys also recommend some brands as well.
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