Here's what other sites are saying:
Ends slide over the earbows & can be adjusted to cover temples. Soft slider bead has a specially designed interior for different materials. Lycra/cotton blend, stretchy, adjustable lengths, colorfast, washable, made in USA. 14" long on each side, Cotton: 1/2" wide, Micro: 1/8" wide.
- Vargo Outdoors
Adjustable cotton/Lycra(R) spandex eyewear retainer is designed to keep thin or wire-framed sunglasses securely and comfortably on your head. Tube design fits snugly on the ear stems of your glasses for cushioned comfort at the temples. Flexible bead slides along the back of the strap to adjust the fit.
With a fit for medium frames, Croakies adjustable Cotton Suiters are designed to rest comfortably around the neck or back of the collar.