Reindeer Fiber Optic Stocking If you love fiber optics, wait until you see this stocking! Each of the beautiful embroidered metallic-fabric stockings in this series twinkles with tiny fiber optic lights when you touch a button on the cuff! There's a small battery box concealed inside the stocking (with a velcro closure) that takes 3 AAA batteries, which are included. Each stocking is 18" tall.