This speed hiker attacks terrain. Its ventilated mesh upper is made for hot temps and forging creeks. Efficiency comes from the unifly midsole. In general we recommend the following guidelines for cleaning the footwear:Cleaning: on a regular basis, brush away any surface dirt with a soft brush. After extended, rugged use, wash with mild soap and warm water. Be sure to rinse all soap off as it is hydrophilic. Drying: open footwear fully, remove the insole and laces and dry at room temperature. Never expose to heat! Conditioning: recommended treatment depends on construction and materials of the footwear (most treatments do alter color and appearance).