Montbell Down Pants Size: S I usually wear size M, but size S was a perfect fit. It's a used item, so there's a feeling of wear, but I think it functions perfectly fine. @Product Description These pants combine high-quality down and ultra-lightweight shell material, achieving a high level of both warmth and lightness. The fabric has a calm texture, making them ideal not only as a mid-layer but also for wearing in tents or mountain huts.