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This is a hand made, leather eye patch with an adjustable, double leather and waxed cotton cord. The patch is medium but it's also domed for comfort. It's finished with an 'edge coat' on the back and edges for a clean look.
This strap should fit most adults, unless you have a extra large or small head. Fully adjustable through multiple slider knots. It might take a bit of fiddling to get them adjusted just right for you.
Trivia - pirates and sailors sometimes sported an eye patch so they could be in the bright sunlight, then run below decks (where it was REALLY dark), switch the patch to the other eye, and be able to see in the dark without having to wait for their eyes to adjust. Mythbusters did it, therefore it MUST be true...