The Alp Trainer Mid GTX is a mid-high mountain boot for hiking with GORE-TEX Extended Comfort technology, making it "all-around" waterproof and breathable in all temperature ranges. The membrane is waterproof to the inside while wicking sweat and heat to the outside. Since the shoe is not lined, it is ideal for those looking for a comfortable and breathable solution The upper shoe of the mountain boots is made of suede and edged with a protective rubber layer. The durable and adaptable Vibram Hike Approach sole is suitable for many types of terrain in the mountains. The Alp Trainer Mid GTX combines SALEWA's patented technologies for an Alpine Fit 100% blister-free guarantee: Flexible Multi-Fit Footbed Plus (MFF) with removable insoles to adapt to the individual foot shape, climbing shoe lacing system to the toe area for a more precise fit and 3F system for firm support in the heel and ankle area.