I bought the small size for my 13 year old son. He loves them, very warm, and a perfect fit. The fact that they fit him would indicate a step up in size may be in order, since he is at 5’2 and 100 lbs. What I liked about them is that they saved me $20 over buying the Under Armour cold gear, which he really wanted.

Duofold Men’s Polypropylene Mid Weight Tagless Bottoms are like wearing nothing at all. Since they are long, when worn under your favorite Levi 501′s or any jean or long pants there is nothing to bind or show a an underwear line, it looks and feels like nothing, in other words “they look hot”. Very comfortable and they feel great! I wear them all year-round and for me, never too warm. You can wear them to work-out in the gym.