What is bSoft Jersey? bSoft Jersey is a stretchy silky soft material that feels light against your skin. This material is 95% bamboo viscose, 5% Elastane. Short sleeve scoop neck top features a slight flair around the hips to give this pajama top a relaxed fit. Classic fit shorts sit at the natural waist and stays in place with a stretchy elastic waistband for a comfortable fit. Machine wash cold with like colors. Non-chlorine bleach only. Tumble dry on low heat. Sizes run as: Small (2-4), Medium (6-8), Large (10-12), XL (14-18).