Whether you're skiing through bone chilling temps or digging out your car after a two foot dump, The North Face Men's Thermoball Insulated Snow Pant keeps your legs toasty warm through winter's worst. Mimicking the heat trapping clusters of down insulation, PrimaLoft Thermoball is incredibly efficient at heat retention, providing the same levels of warmth as 600 fill down insulation. However, unlike down insulation, Thermoball retains heat in the wettest, nastiest weather, ensuring comfort through mid winter blizzards, deep powder dumps, and downright damp conditions. Keeping you comfortable through raging snowstorms and oncoming rain showers, the HyVent 2 layer membrane repels outside moisture while retaining high levels of breathability for maximum thermo regulation. Speaking of temperature regulation, these pants feature a Chimney Ventilation system, which combines StretchVent gaiters with inner thigh vents for maximum heat transport and moisture evaporation. Much like a free flowing exhaust, the mesh lined upper gaiters channel warm air up and out of the pant's inner thigh vents as you move. This means you'll be much more comfortable on warmer spring days, also preventing perspiration build up when you're skiingriding at high speeds.