Mammut Mercury Mid III GTX Mens Walking Boots. Mammut Mercury Mid III GTX Men's Walking BootsTake on any trail, in any weather in these Men's Mammut Mercury Mid III GTX Walking Boots. They are crafted with a GORE-TEX Performance Comfort membrane lining, which ensures full waterproof protection, while also ensuring beathability. A Memory Foam inner provides comfort and support to the feet and the look is completed with a grippy Vibram outsole and Mammut branding.> Men's boots> 3 zone lacing> GORE-TEX Performance Comfort membrane lining> Waterproof> Memory Foam inner> Grippy Vibram outsole> Reinforced toe> Padded ankle collar> Mammut branding> Upper: leather/ textile> Lining: textile> Outsole: synthetic