All masks come with elastic cord that is untied, allowing for customized fit. 

Adult size fits average to large adult heads.  Youth fits from age 12 - 18 and a small adult head.

Material:

Adult: 2 layers of Cotton fabric. Some are made with one layer of antibacterial fabric and are noted in the description.  The antibacterial effect will last approximately 25 washes according to the manufacturer.

Youth: 3 layers, 2 layers cotton and 1 layer antibacterial fabric.

Ear elastic cord is left untied so the size can be customized and the ends can be hidden in the casing.

Recommended care: wash by hand or machine, hang to dry.

3D mask pattern is courtesy of japanesesewingbooks.com.