Material: Polyester Fiber, US Size Pajamas,loose,snug fit and very comfortable to wear. Top: Super soft and relaxed fit knit sleep tee shirt with round neck, short sleeve and letters printed. Pant: Soft and comfy knit loose-fit boxer shorts with elastic drawstring waistband and cute dolphins print. Sizes available in XS (2-4), S(6-8), M(10-12), L(14-16), XL(18-20). Available for hand wash or machine wash, do not bleach.