The Salomon Quest 4D is a hiking boot that combines durability and comfort. I purchased it for mountain climbing and used it only once. Regarding the dirt, it's mainly soil from the climb, so I think it can be cleaned up with a brush, etc. The mountain I climbed was the Northern Alps, and the usage time was about 15.6 hours. There is almost no wear on the soles. - Brand: Salomon - Model Name: Quest 4D - Color: Black Thank you for looking.