Elastic fabric with metal adjuster bars and snaps. 

If you have any questions about the item, please feel free to contact me before making your bid or purchase.  If after receiving the item there is a problem with it, please let me know before leaving me feedback.  I cannot fix what I don't know about.  I try to inspect every item thoroughly before listing but I have over 8000 items in my store and sometimes things slip through the cracks.