Temperature: -50°F / -45°C Features: -Waterproof synthetic leather and water repellent ripstop nylon -Sealed seams at the upper with the H2O Seal process -Velcro straps -High visibility reflective inserts Insulation -Removable triple density insulating liner with stabilizing arch (sizes 13 to 8) -Removable, insulating and moisture-trapping felt insole Shell -Ultra light, waterproof, flexible and insulating EVA base -Grippy and stable synthetic rubber sole