DESERT MOSS VINTAGE Tie Dye Long Underwear - Large No sense no rips from non-smoking home Indera Red Union Suit 100 Cotton Thermal Underwear LIndera tie dye long underwear is a type of union suit, also known as long johns, that comes in a variety of styles and colors. It's made from a blend of cotton and polyester, and is designed to trap and retain body heat. Some styles feature a waffle knit texture that helps keep the cold out