Protection Plus Vision; Because your eyes are worth protecting; Super Sunnies set the standard for safety; Meets Code of Federal Regulations 21 CFR 1040.20. For indoor/outdoor use.Directions1) Untie elastic and push ends through openings provided on each Super Sunnies Eyeshields eye cup, working from back to front. 2) Tie a double knot at each end of elastic. 3) Adjust for head size and proper fit and tie another double know to shorten the elastic. If needed. Cut off excess elastic. 4) Never use a Super Sunnies Eyeshield that is broken, cracked or missing a lens, due to eye safety hazard of su