This AxMask Piccolo Cover is made of durable white cotton and is designed to significantly decrease the likelihood of your woodwind instrument unintentionally releasing an excess of moisture particles. 
 
*Note: item is smaller than appears in image as it's specifically sized for Piccolo.*
 
From the AxMask website:
"The right hand is inserted through an elastic opening for a secure fit, while the left hand enters loose for functional page-turning and a quick restart."