Indera Big Men's Thermal Underwear Pants - Traditional Long Johns BIG MENS Thermal Underwear Pants - Traditional Long Johns. Rated for cold temperatures. Thermal knit traps and retains body heat for comfortable warmth THIS IS A SNUG-FITTING GARMENT. Go up 1-2 sizes for a looser fit. Refer to Hand Measurements chart in the photo gallery for each size's measurements. MADE IN THE USA by Indera - One of the largest suppliers of thermal underwear products in the USA for over 100 years. STURDY ELASTIC WAISTBAND; comfortable rib knit leg cuffs . Cotton rich blend combines the soft comfort of cotton with durability of polyester. LIGHTWEIGHT FABRIC: 5 oz thermal knit - 65% Cotton/35% Polyester.