Girl, get your glow on! This running shoe features fun, glow-in-the-dark accents alongside a web-like pattern on its mesh outer, laces, padded collar, mesh lining, signature padded Sport Comfort insole, and non-marking outsole. Manmade materials. Glow-in-the-dark accents are decorative only and not meant to be a safety feature that will enhance the wearer's visibility at night. Glow-in-the-dark products require a 2-hour charge in sunlight or artificial light before they will glow.