A shut slider to adjust the length of strap enabling it to be worn around the neck or against the head.

An effective way to keep your valuable eyewear secure.

Freely adjustable elastic length.

Prevent glasses fell.

This adjustable strap will fit many styles of eyewear.

2Pcs Adjustable Sunglasses Neck Cord Strap Glasses Wearing Neck Holding Wire Eyeglass Chain Glasses String Lanyard (Random Color)