All the standard MUCK BOOT features plus:

• Fleece lining
• Stretch-fit topline binding snugs leg to keep warmth in and cold out
• 8mm CR flex-foam bootie with four-way stretch nylon, 100% waterproof, lightweight and flexible
• Bob-tracker molded outsole is rugged, aggressive and durable for maximum protection and stability 
• Double reinforcements on the instep, heel and achilles areas
• 2mm thermal foam underlay added to the instep area for additional warmth
• EVA molded midsole with contoured footbed
• Reinforced toe
• Added toe protection with a wrap-up bumper
• Comfort range of -60° F to 40°F