The Baffin Impact as been tested t both the North and South Poles, IMPACT performs flawlessly under the most demanding conditions. IMPACT is appropriate for extended periods of time in extreme cold weather, snow and/or ice-covered environments, where activity level may be low to moderate. Boasting the most comprehensive inner boot system, IMPACT features the highest level of cold comfort in the Baffin range. Insulation level: Removable Comfort-fit multi-layer inner boot system Waterproof level: B-Tek Dry waterproof base Snowshoe compatible Technology Upper: Double buckle fastening for added security Nylon locking snow collar to protect from the elements Base: Arctic(TM) Rubber shell to provide lightweight flexibility, cold-resistance and resilience EVA midsole for lightweight insulation and cushioning Polar RubberA(R) outsol