The First Layer men’s long underwear features the same keyhole comfort you’ve come to expect, but in a full length pant. Silky soft Modal fabric fits close to your skin so they fit nicely underneath your pants. With a Keyhole pouch built in, you no longer need to wear regular underwear underneath your long johns which eliminates a layer and any possibilities of bunching up. It almost feels like you are wearing nothing at all, but yet they keep you warm and dry all day. In addition our fabric is very breathable so when you are inside you do not over heat.