The Stanfield's Men's 2-Layer Wool Blend Long Sleeve Combination Onesie offers double the layers and double the comfort. Our 2-layer collection combines a soft cotton/polyester blend as an inner layer and a moisture-moving merino wool and polyester blend as an outer layer. The two-layer fabric of this union suit is a unique jersey knit that offers you the ultimate in warmth and comfort. The inner layer is a blend of 50% cotton and 50% polyester for absorbency and softness. The outer layer is a blend of 50% merino wool and 50% polyester that offers you warmth and strength. The space between layers insulates, trapping warm air from your body. These layers give you one of the warmest garments you can put next to your skin. This men's onesie features anti-microbial treatment for added performance, set in sleeves with rib cuffs, a full-button front and a "trap door" on the back with a button closure.