bSoft Women's Sleepwear Bamboo Jersey Button up Short Sleeve Sleepshirt 95% Bamboo Viscose/5% Elastane Classic Button down sleepshirt with shortsleeves Sleepshirt features a small side slits that provides extra movement for this classic shape bSoft Jersey is a stretchy, silky soft material that feels light against your skin. The material is made of 95% viscose from bamboo and 5% elastane Sizing Runs as follows: Small/Medium (4-12) Large/X-Large (12-20).