Zamberlan Ull GTX RR WL PL Boa Hiking Shoes - Men's PFAS-Free Black/Grey 10.5. Gore-Tex Insulated Comfort membranes combined with Primaloft insulation provide two layers of extreme warmth and comfort while the Vibram Star Trek II outsoles provide exceptional grip on snowy icy terrain. The patented double BOA closure system allows for customizable fit zones ensuring a more comfortable personalized fit without ever having to take off your gloves.image Specifications for Zamberlan Ull GTX RR WL PL Boa Hiking Shoes - Men's PFAS-Free: Manufacturer: Zamberlan Gender: Male Color: Black/Grey Footwear Type: Shoes Weight: 965 g Footwear Upper Fabric/Material: Synthetic Insole Material: Flex 4mm + PE Lining Material: Gore-Tex Insulated Comfort Midsole Material: Double Density PU Wedge + Light TPU Layer Outsole Material: Zamberlan Vibram StarTrek II Condition: New Package Contents: Zamberlan Ull GTX RR WL PL Boa Hiking Shoes - Men's PFAS-Free Zamberlan 3032ZBGM-45-10.5: Ull GTX RR WL PL Boa Hiking Shoes - Men's PFAS-Free Black/Grey 10.5