Rothco Union Suit S. The thermal underwear features a classic ribbed knit 8 button placket and front vertical seat flap with 1 button. Specifications for Rothco Union Suit: Manufacturer: Rothco Age Group: Adults Gender: Unisex Color: Red Fabric/Material: 100percent Cotton Features of Rothco Union Suit Material: Cotton Material Specs: 100percent Cotton Weather: Cold Weather Package Contents: Rothco Union Suit Rothco Union Suit Small 6453-S