Rubber sole Shaft measures approximately 4.75 inches from arch The Alp Trainer Mid GTX is a mid-cut hiking boot with a GORE-TEX Extended Comfort lining for optimal waterproofing and breathability in moderate and warmer climate conditions or during higher activity levels. Water is kept on the outside, while perspiration can easily escape from the inside. Thanks to their non-insulated construction, they are the ideal solution for people who value outstanding climate comfort and heat release. The boot has a suede leather and stretch fabric upper with a protective PU-coated rand, while the durable and versatile Vibram Hike Approach sole covers a wide spectrum of mountain terrain. The Alp Trainer Mid GTX integrates patented SALEWA technologies to offer the Alpine Fit 100% blister free guarantee: customizable Multi Fit Footbed (MFF) with interchangeable layers so you can adapt it to the unique shape of your foot; Climbing Lacing right to the toe for a more precise fit; 3F System for firm ankle and heel support.