One Piece Bear 100% Snug Fit Cotton Pajamas Mix and match for a variety of sleep options, making bedtime extra easy! 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. Cotton pjs are not flame resistant. To help keep children safe, cotton pjs should always fit snugly.. 100% cotton rib or 60% cotton/40% polyester rib depending on style. Imported. Machine washable.