Rails Kellen Pajama Set in Blue. - size S (also in XS) Rails Kellen Pajama Set in Blue. - size S (also in XS) 100% rayon. Hand wash cold. Front button closure. Elasticized waistband with drawstring closure. Item sold as a set. Imported. RAIL-WI12. PJ-508-124-436. Launched in 2006, Rails is a unique brand of fashion fusing California comfort activewear with European styling. High quality fabrics, narrow cuts, and unique lines; this collection is influenced by international travel and metropolitan lifestyle.