The Baby Sunnies Edit

UV400 means the lenses block ultraviolet light up to 400 nanometres, which is 100% of UVA and UVB. Here's what the number actually means, why UV400 and polarized aren't alternatives, and the four checks that tell you whether a pair really has it.

The six criteria that separate real infant sunglasses from tinted plastic: UV400, shatter-resistant lenses, a flexible frame, the strap, fit and materials.