Mack Weldon arguably makes the best men's underwear, and now some of the best "Long Johns".  The reinvented thermal long underwear uses their WARMKNIT fabric which is made with insulating Thermolite® technology and a micro-waffle knit for lightweight warmth.

Features include a No-Roll Waistband, Stay-Put Ankle Cuffs, Functional Fly and is Tagless for comfort.  

43% Modal / 38% Thermolite® Polyester /
15% Wool / 4% Spandex

• Insulating Thermolite® technology
• Micro-waffle knit
• No-roll waistband
• Stay-put ankle cuffs