SNOWLINE 8.5?The SNOWLINE? combines Grub?s unique INSU-FOAM ULTRA? technology with advanced 8.5 thermal engineering. UNDER FOOT CHASSIS? HARD-TOE? technology NITROCELL? insulating and cushioning foot-bed Featuring the VIBRAM MULTISPORToutsole with shock absorbing DURALITE? lightweight mid-sole with the addition of a HIGHLOFT?fleece lining for added warmth. A high performance field boot with 8.5 Technology, maintaining a comfortable temperature in colder weather.