These are Star Trek Pajama Set! Space: the final frontier. These are the voyages of the starship Enterprise. It's continuing mission: to explore strange new worlds, to seek out new life and new civilizations, to boldly go where no man has gone before.! These Star Trek The Original Series costume pajamas come in 2 styles. The yellow color scheme of Captain Kirk or the blue color scheme of Commander Spock! They feature a top-notch embroidered Star Trek Insignia on the front left chest of the long sleeve shirt. Captain Kirk has the Starship Duty Insignia, while Spock displays the planet symbol which represents the Sciences division. On Captain Kirk's sleeves, there is the dual-line and one dotted line graphic print, while Spocks has dual-line graphic print on the sleeves. They both come with solid black pants. . They are listed in regular men's sizing. Please See Size Chart for exact measurements These are the best!