Crafted in plush fleece with a jersey top, this 2-piece pj set is extra cozy! Matched set keeps bedtime dressing easy. Carter's polyester is flame resistant. But is it chemically treated? No way! Carter's cotton pjs are not flame resistant. But don't worry! They're designed with a snug and stretchy fit for safety and comfort. # Pieces In Set: 2 Included: 1 Pajama Pant(s) 1st Piece Description: Top 1st Piece Fabric: Jersey 1st Piece Fiber Content: 100% Polyester 1st Piece Care: Machine Wash 2nd Piece Description: Pants 2nd Piece Closure Type: Full Elastic 2nd Piece Fabric: Microfleece 2nd Piece Fiber Content: 100% Polyester 2nd Piece Care: Machine Wash Features: Flame Resistant 1st Piece Neckline: Crew Neck 1st Piece Sleeve Length: Long Sleeves Country of Origin: Imported Fabric and fit are important safety considerations for children’s sleepwear. Sleepwear should be flame resistant or snug-fitting to meet U.S. Consumer Product Safety Commission sleepwear requirements.