Chums Adjustable Orbiter Eyewear Retainer: Black, Sold Individually - Walmart.com
Slip Fit – Chums
Amazon.com: Chums Original Cotton Retainer - Unisex Eyewear Keeper for Sunglasses & Glasses - Adjustable Fit, Washable & Made in USA (Standard-End, Berry) , One Size : Tools & Home Improvement