Wind-powered travel across an open ice cap: you ride skis or a snowboard while a kite, flown on control lines, pulls and steers you over the snow.
It is physically demanding and technical — you must manage the kite's power in gusty, cold, exposed conditions and be a competent skier or boarder — and the environment is a serious high-latitude glacier with crevasse risk at the margins, brutal wind chill and fast-changing weather.
Distances can be huge when the wind is good, and nonexistent when it isn't, so trips are entirely weather-dependent. Falls, kite tangles and cold are constant companions.
For those with the skills it is euphoric, near-effortless gliding across a white infinity; for everyone else it is a steep and chilly learning curve.