Long underwear
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Long underwear, often called long johns, is a style of two-piece underwear with long sleeves and long pantlegs that is normally worn during cold weather.
Modern long underwear has largely supplanted the traditional union suit. It is usually made from fabric with a box-weave texture, although some varieties are also made from flannel.
The type known as "thermal underwear" is made from two-ply fabric, which uses trapped body heat to insulate against cold air.
Sir Benjamin Thompson, Count Rumford has been credited with inventing thermal underwear.
The two-piece design is credited to Truro, Nova Scotia-native Frank Stanfield of Stanfield's Limited on 7 December 1915.
East Valley Apparel patented the interlock knit pattern garment in 1996. Their "ChillTech" garment is made of 100% Comfortrel polyester.