It would be highly illogical not to make these Star Trek sleep pants the next great addition to your sleepwear collection. They're simply too comfy and cozy. The graphic design on these Sleepwear displays classic artwork of Spock and his signature line: 'This Is Highly Illogical'. Use the elastic waistband and adjustable drawstring on these PJs to find the perfect fit. Space can get pretty cold, but these Sleep Pants consist of a cotton-blend fabric which will keep you toasty warm. If you're looking for comfortable sleepwear, then add these Star Trek Sleepwear to your collection of PJs and live long and prosper.