Indera Big Men's Thermal Underwear - Crew Shirt Long Johns LIGHTWEIGHT big mens thermal underwear: long-sleeve crew shirt - traditional long johns. Rated for cold temperatures. 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. TRAPS HEAT: Thermal knit traps and retains body heat for comfortable warmth. Rich cotton rich blend combines the soft comfort of cotton with durability of polyester. FABRIC: 5 oz lightweight thermal knit - 65% Cotton/35% Polyester. Shrinkage controlled for lasting size and shape. MADE IN THE USA by Indera - One of the largest suppliers of thermal underwear products in the USA for over 100 years.