100% Polyester Elastic closure Machine Wash Moisture management technology wicks moisture away,this cap breathes well, and drys quickly, perfectly absorbs all sweat during sports activities Lightweight helmet liner,Easily fits under helmet,baseball cap,The breathable fabric of this headcover can lose heat by evaporation This cap can be wear on the sensitive scalp of someone who had lost hair due to medical treatment.because it won't itch or scratch,Great headwrap for chemo patients This beanie stretches easily ,With adjustable straps,you can tie this sweat beanie only as tight as you are comfortable with.It is suitable for men and women The pack includes 4 caps, Machine washable,wont shrink,The color stays put during washing and is quickly dry Sweat-Wicking Head Wrap Dew Rag Skull Cap Quick-Drying Helmet Liner Hats for Men and Women Black 4 Pack 4 Pack - BQY56CT8Q