These pajamas are made of 100% Cotton and great for the colder weather. Includes cuffs on the arms and the ankles, and an elastic waistband on the pants. Pajamas are Machine washable. Please make sure to try on the pajamas before washing to make sure they fit as you can"t return pajamas once they are washed. Sizing runs true to size 2T (32-34" / 26-29 lbs), 3T (34-37" / 29-33 lbs), 4T (37-39" / 33-36 lbs), Kids 6 (45-48" H / 45-55 lbs / 23" W), Kids 8 (51-54" H / 65-72 lbs / 24 W), Kids 10 (54-57" H / 73-81 lbs / 25" W), Kids 12 (57-60" H / 82-93 lbs / 26" W). not flame resistant, must wear snug fitted.