These cotton 2-pack pajamas for boys are Lego Ninjago brand. One red pair is printed to look like Kai, the Elemental Master of Fire. The black pair is printed with characters from the Masters of Spinjitzu Lego Videos. Both pair of pajamas feature a full length sleeved top with pajama pants bottoms. The bottoms have an elastic waistline. The sleeves and leg bottoms are cuffed with jersey knit fabric. These pajamas are designed to fit snug. The 100% cotton knit fabric is machine washable and is comfortable to wear.