SKIMS | NWT Staight Leg SLEEP PANT! Heather GRAY Large Rayon 95%-Spandex 5% blend. Discontinued Skims Sleep Line. The most comfortable sleeping fabric SKIMS offered IMO…fabric is a knit blend rayon/spandex that feels cool to skin, and when asleep. Have several sleep tanks, thong panties and got these straight leg pajamas to go with…pant seemed to run tall/long, so never worn -NWT- would be a great fit for someone else! Questions? Leave a comment below!