UPPER / LINING • Leather and synthetic upper • TPU shelled upper for extreme durability and protection • Removable / washable inner boot adds warmth and can be worn on its own as a camp boot • Cord and lock lacing system for quick secure fit • Bellows tongue keeps debris out • Waterproof membrane provides impermeable but breathable barriers • Snowshoe strap ridge for stability • 600g Merrell Opti-Warm lightweight, low-bulk, synthetic insulation keeps you warm in varying conditions • ColdSmart™ Thermal System regulates your temperature with airflow channels keeping your feet dry and warm • 300g Merrell Conductor™ Fleece provides lightweight, versatile heat retention in varying conditions • Aegis Anti-Microbial solution provides resist odor • Ortholite anatomical footbed • Merrell Active Heat Insole with silver reflective film for added warmth • Removable boot-in-boot system adds additional warmth; comfort range -40F/-40C