SIZE: One size fits most. Fit M (22.05inch ~23.6inch) head circumference and combines plenty of stretch with a snug. Flat-size: length: 12 Inch, width:10 Inch. Key Product Features Prompt: Need Receive Quick ( Please Choose Fulfilled by Amazon : Prime). Key Product Features MATERIAL: High quality material Acrylic & Polyester .Comfort, breathable and excellent elasticity will stretch to fit most head sizes. DESIGN: Thin Cool and Slouch, have soft Comfortable lining but lightweight. Simple But timeless for men and women, Daily Suitable for Summer. CLEANING AND NURSING: The beanies can be hand washed when needed. Dipping the beanies in warm water with mild soap makes it as clean as new!