Omni-Tech™ sheds water and releases excess heat with multi-layered breathable materials, so you stay dry and comfortable in the rain Omni-Heat™ thermal-reflective breathable lining retains warmth using silver dots that reflect body heat, so your feet stay warm and comfortable as temps drop Lightweight 400g insulation for warmth in cold conditions Bungee lace closure system for quick and easy on and off Used one season, we hardly had snow only worn to school. Only signs of wear are on the inside lining. It's already a fluffy pilling type of fabric brand new. I attached stock photos of the boot so you can see what the inside fabric is like brand new. Clean smoke free home.