My son wore these for about a week over the last two years. We live in FL but visit the north over Christmas time. These were purchased from REI. Kept my kiddo's feet super warm and dry! Great used condition. Smoke and pet-free home. Features -Waterproof nylon uppers with synthetic rubber shells are seam sealed to ensure protection from water, slush and snow -Zylex® liners made primarily from recycled polyester keep feet warm, dry and comfortable even after hours in the snow -3-layer system wicks moisture, traps body heat and keeps cold air out -Adjustable snow collars have lace locks that are easy to grab, with gloves or without -Adjustable hook-and-loop straps secure the fit through the midfoot -Nite Rays reflective details enhance nightime visibility -Synthetic rubber outsoles provide superior traction in cold and frozen conditions -Comfort Range: -40 degrees (F)