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Growing up in Bellevue, Ohio, just south of Lake Erie, Brian Kaiser heard stories about locals who went ice sailing, gliding their boats across the frozen Great Lakes during winter’s most frigid months. In January he got a chance to learn more about this obscure sport at the North American championship, in which DN iceboats—a class of vessels conceived in the U.S. that feature a minimal hull and a perpendicular crosspiece with attached skates, or “runners”—raced across Black Lake, in Michigan. He donned crampons to tread the eight-inch-thick ice and taped a hand warmer to his camera after it began to freeze amid the zero-degree conditions. “This sport is a labor of love,” Kaiser says. “The weather is incredibly fickle, and some have to travel hundreds of miles in the dead of winter to get to the lake.” Ice sailing requires two key elements: strong winds to help propel the 12-foot boat, and a lake surface solid enough to support its 150-pound weight, plus the pilot. While this year’s competition went off without a hitch, ice sailing’s long-term future is uncertain. Climate change is causing milder winters in the region and has drastically decreased the lakes’ ice cover. While shooting these photos, Kaiser was as interested in spotlighting this unique pastime as he was sharing what may eventually be lost to the environmental crisis.