Playing outside in chilly weather is more fun when he wears SLM Boy's Cotton Thermal Sets Warm Underwear Pajama Long Johns. This ultra-comfort thermal set will keep him feeling toasty on brisk weather days. Our ribbed thermal collection is made of 100% cotton known for being moisture-wicking, lightweight, and breathable. In addition, the bottoms feature an elastic waistband to provide a better, more comfortable fit. These thermal sets are ideal for everyday wear, whether he's indoors or out. They come in various colors like Black, Gray, and Navy Blue, making them easy to layer under all his cold-weather favorites. The classic waffle knit pattern looks great with everything, from jeans and joggers to snow gear and thick socks!