Light weight, elastic gaiter that keeps mud and debris out of the shoes. The gaiter is not waterproof but dense enough to repel light rain and snow, still with a very high level of breathability. A major injury risk during winter is that the Achilles tendon gets wet, cold and stiff. Sealing the edge of the shoe, and adding warmth to this area, helps preventing this problem.
There are three sizes:
Small (for EU sizes 36-40 or US Women's 5.5-9, Men's 7 or smaller)
Medium (for EU sizes 41-44 or US Women's 9.5-12, Men's 8-10.5)
Large (for EU sizes 45-48 or US Men's 11-14)