GORE-TEXÂ® Lining - The most effective waterproofing technology available, creating a water tight seal whilst allowing for internal moisture to evaporate. Essential for any serious outdoor enthusiast. Breathable Mesh Lining - Allows the foot to breath, for greater comfort over the miles. Air Mesh And synthetic Upper - Breathable, durable comfort. Mid Cut Build - Provides greater coverage and protection from the trail. Re-enforced Toe and Heel - For greater support and protection from the trail.