100% pure cotton smooth rib knit material (1x1 rib knit) for natural softness. The original one piece union suit. Full length 9 button placket front. These warm thermals provide cold weather comfort thermal with moisture wicking technology to stay extra warm and dry. Long sleeves. Reinforced collarette, rib knit cuffs and ankles to retain snug-fitting shape to seal in body heat. Reinforced shoulder seams for longer wear, extra strength and durability. Wide overlap, 1 button seat. Vertical rear seat flap. Double thick cuffs. US made components, assembled in North America. Full cut for comfortable fit. Shrinkage controlled for long-lasting fit. Washing instructions included. Red color.