Set includes: 1 fitted sheet, 1 flat sheet, and 2 pillowcases (Twin and Twin XL include 1 pillowcase)Material: 100% Cotton FlannelWeight: 145 grams per square meter (GSM) weight for durabilityCertificates: All parts of this products are OEKO-TEX certifiedCare: Machine washable. To prevent colors from bleeding, wash with like colors. The crisp, smooth feel of these sheets will get softer with every wash. Fabric softener will help make bedding ultra-comfortable over time. Please follow product care label instructions for best results.