Review on Stay Warm and Cozy with Artic Pole 2-Piece Boys Thermal Long Underwear Set - Perfect Cold Weather Base Layer and Bedtime Fitted Pajamas for Boys by Brian Kingsford

Grandchildren used at scout camp every night in single digit temperatures. He wore two pairs with a Boy Scout uniform over them. Only remove your uniform before climbing into your sleeping bag at night. Alongside teenage and 20's daywear with gusts of 25-35mph, he wore a jacket and then his double lined HEAVY coat. He was warm enough for the whole trip so his discomfort was the least! I'm not doing this underwear justice, the key was the multiple layers. Heat packs for legs and arms etc etc but they worked fine for sleeping in his zero temp sleeping bag. also had a zero degree tent.