A cold clarity catches the breath before your boots hit the compacted snow. You meet your winter mountain guide outside Tiso in Aviemore at 8:30 a.m., the town still soft with frost. Within an hour the village falls away and the landscape opens into a pale, tundra-like plateau where wind has sculpted drifts and rime decorates the granite like salt. The guide fits your crampons, checks the ice axe, and points toward a skyline of broad, scooped corries and the long rise of the Cairn Gorm massif — the day becomes a study in how to move with certainty over winter ground.