He's slumber party ready in this loose fit PJ set, complete with a long-sleeve top and matching pants. 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: Fleece 1st Piece Fiber Content: 95% Polyester, 5% Elastane 1st Piece Care: Tumble Dry, Machine Wash 2nd Piece Description: Pants 2nd Piece Closure Type: Full Elastic 2nd Piece Fabric: Fleece 2nd Piece Fiber Content: 95% Polyester, 5% Elastane 2nd Piece Care: Tumble Dry, Machine Wash Fabric Description: Fleece 1st Piece Neckline: Round 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.