For really cold days, our Summit Bibs use 6 oz. Lamilite, a lightweight, high loft, continuous filament polyester that has been treated with a silicone coating making it hydrophobic and antistatic. This snowgear features durable Teflon-coated waterproof, breathable nylon shells, adjustable hook and loop cuff closures, and ballistic 600 denier polyester reinforcements for added durability. The heavy 17 ounce non-pill polyester fleece linings that add warmth and comfort in extreme weather conditions.