Narue Cake Pattern Pajamas, Pink The fabric is "cotton-filled kessei" (bonded fabric). This warm material is made by combining two layers of fabric to create a single layer, with batting inserted between the layers. The addition of batting increases the thickness and heat retention. An air layer is created between the fabric layers, resulting in a soft, fluffy, and gently warm feel against the skin. While not as thick as fluffy materials, it offers a "moderate" warmth. This material is recommended for those who don't like overly fluffy textures. Material: Cotton-filled kessei (bonded fabric) - Outer and inner fabric: 65% polyester, 35% cotton; Batting: 100% polyester Washing: Machine washable Size: M-L