Its all about the fabric. An all-cotton knit jacquard jersey with an insulated poly core. A material that appears quilted but without any actual quilting, more cellular in the way that the individual insulated cores are formed. The result is an incredibly warm and comfortable garment that is lightweight and can stretch with ones movement. Woven cotton facings at collar, neckband, placket, and cuffs to reduce thickness and add stability at stress points.