Julbo Kid's Solan Sunglasses, Spectron 3+ Lens, Blue/Yellow, 4-6 Years. Spectron 4 Baby lens is a dark lens, blocking 95% of the visible light, for max protection for your child's eyes. The symmetrical shape of the sunglass eliminates a right-side-up or wrong-side-up. The hingeless design prevents little figures from being pinched. Comes with a flat elastic strap in order to keep the sunglasses on your babies head.