100% Cotton Made of high quality soft cotton, breathable, quick dry, absorbing sweat. Lightweight and comfortable. Head circumference: 58cm. Adjustable size: 36x19cm. One size fits for most. Not too tight or loose. Hand washing or machine washing both are available. 7 colors are available. Nice for women girls with hair lose on chemo, alopecia, lupus or other medical hair loss. Ideal for riding, baseball, running, skiing, yoga and other sports activities. Sweat Wicking Skull Cap Beanie Helmet Liner Quick Dry Bandana Head Wrap Bicycle Head Pirate Scarf Chemo Cap - B74Q12URS