Grundens Grundies Base Layer PantA Grundens Grundies Base Layer Pant will keep you warm when fishing in cold weather. Grundies are constructed of a Merino Wool, Polyester Hollow Core and spandex blend, making them extremely thin, but able to retain heat. They are soft, comfortable and will keep you super warm when the mercury drops. Stop wearing thick layers of sweat pants under your foul weather gear or waders! You can get better warmth with a thinner material. Grundies are the