Croakies has combined the features of the ARC System with the cable adjustment technology of their Endless System, to make the most highly adjustable eyewear retainer on the market, the Croakies Arc Endless Sport Eyewear Retainer 16". It's a cinch to adjust, and has a modest profile with a refined technical look. Features:Stainless steel cable 16 inch extends to 16%u2033 and shortens to 10%u2033 2 pair of REG/XL EndsRe-attachable plug n%u2019 play ends