These are "sleeping bag quilted pants." They're lightweight and wrinkle-resistant, so they've become my go-to warm winter pants. I also often wear my "fleece-lined pants," which are incredibly warm, but the "sleeping bag quilted pants" are so light and comfortable that I find myself wearing them on days that aren't extremely cold. This year, I added a little twist to the quilt stitching. I changed the pattern from usual to give them a more original feel.