NRS Men’s Expedition Weight Union SuitFrom the patent of the first union suit in 1868, the one piece thermal layer has been known for warmth, comfort and freedom of movement. While that part hasnt changed, upgrades in design and materials, like the thick plush fleece of our Expedition Weight Union Suit bring a modern, high performance take on a classic. High stretch poly spandex fleece delivers outstanding warmth and breathability. Designed to sustain many seasons of wear, the 4 way