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Don’t sacrifice functionality when temperatures drop. Instead, reach for an ultra-warm, yet ultra-flexible union suit from Originally designed in New York in the 19th century as a replacement for bulky or uncomfortable long underwear, the union suit gained massive popularity due to its form-fitting, one-piece construction that kept wearers supremely warm in the harsh Northeastern winters. The design has changed greatly since then and now features blended, breathable fabrics, heat retention technology and a stretch construction that maximizes mobility. Whether running in frigid weather or deep-sea rescue diving, count on our union suits to keep you warm no matter what.