Application: perfect for running, cycling, hiking or other outdoor activities, it's also suitable for daily use
Provide protection: The cotton protects you from dust.
Material: The anti dust is made of cotton material.
Size: Folded: L*W: 10*12cm(3.94*4.72in), strap length 8cm(3.15in)
Stretchy: Elastic strap makes it easy and comfortable to wear, which won't crack and won't hurt your ears