Shorter stack but all the perks, like Primaloft insulation and antimicrobial Polartec lining. Q-Form provides comfort and direction, and the Air Cushion midsole absorbs aftershocks and hardpack. ActiveHeat Silver lining in the insole reflects heat back where you need it. Waterproof Construction. TPU Waterproof Shell. Waterproof Nubuck/Suede Leather Upper/Polyester Mesh Bellows Tongue. Polartec 200 Thermo Insulation Lining Treated with Aegis Antimicrobial. 200 grams of Primaloft Insulation. TPU Backstay with Snowshoe Strap Ridge. Ortholite Insulating Footbed. Activeheat Insole with Silver Reflective Film Between Insulating Polyester Layers. Q-Form Triple Density Compression Molded EVA Footframe. Grade 1 Tapered Nylon Insole Molded to Bottom. Merrell Air Cushion Midsole. 6.5mm Sole Lug Depth. Vibram Thermo Womens Sole/Trek Dura Rubber. Comfort Range to -25F/-32C. Available Colors Dusty Olive, Grey.