Made of 100% polyester. The comfortable and smooth fabric is durable and maintains the original soft texture. Trousers feature elastic waistband and leg-retracting designs for easy relaxation. Pajama has good air permeability to keep warm without overheating.Size availablility from XS - XL. Please calculate your size from the measurement chart below. Care Instructions: Hand wash in cold water is recommended. Line dry, do not bleach or dry clean.