There is no better performing, or more comfortable stretch fabric available than the Nils stretch collection. All products have 4 way stretch, are waterproof/breathable and are 25% Warmer than other stretch fabrics. The Melissa style is a trim fit comfortable stretch pant with jean styling that features belt loops, adjustable hem and Gaiter, critically seam sealed, boot hook in gaiter. and insulation is Thermore - 40 grams.