Couloirs are especially significant in winter months when they may be filled in with snow or ice, and become much more noticeable than in warmer months when most of the snow and ice may recede. These physical features make the use of couloirs popular for both mountaineering and extreme skiing.
Couloirs hold greater significance during winter months due to accumulated snow or ice, making them more noticeable than in summer when most snow and ice melt away. Their physical presence makes couloirs appealing for both mountaineering and extreme skiing.