The Mountain Hardwear Lamina 0-degree Sleeping Bag has Thermic Micro insulation, a synthetic material Mountain Hardwear and Polarguard developed that mimics the positive qualities of down. The zero-degree Lamina is a reliable companion in cold, damp weather. Welded to the bags shell, Thermic Micro doesnt lose its loft when wet like down does, and it has better loft, softness, and compressibility than youd expect from a synthetic. A draft collar and face gasket seal in warmth, and a trapezoidal comfort footbox allows for your feet to rest naturally. The Laminas shell has a durable-water-repellent coating for weather protection.