Design: VIBRAM ® Multi-traction lugs for 360 degree grip, thrust, braking VIBRAM® Trek rubber compound
Designed with a nylon insert that has variable flex zones:
Heel zone - medial flexibility for natural heel strike, and lateral stability for anti-pronation
Midfoot flex zones for natural forefoot movement<
Toe area asymmetric flexibility zones for stability and natural toe-off
EVA midsole light and comfortable.
Just like regular Thinsulate™, it is lightweight, breathable and moisture-resistant. But Thinsulate™ Ultra insulation goes one step further. It is loftier and thicker than original Thinsulate™ insulation-for even greater warmth and comfort, yet still thin enough to allow complete freedom of movement. A mid-loft insulation, it is designed for some of the harshest conditions on earth and retains insulating value in damp conditions.