When choosing the right lenses for kids sunglasses, it's important to balance both function and style. Different lens colours serve different purposes:

• Gray lenses reduce overall brightness without distorting colours — ideal for everyday outdoor play.
   

• Brown or amber lenses enhance contrast and depth perception, making them perfect for sports or activities in varying light conditions.
   

• Yellow lenses are good for low-light situations, like cloudy days.
   

When it comes to lens materials, polycarbonate lenses are usually the best option for sunglasses for kids boys and sunglasses for kids girls. They are extremely lightweight, impact-resistant, and provide natural UV protection, making them safer for active children. Some premium options may offer Trivex lenses, which are even lighter and provide excellent optical clarity.

While style matters — especially when picking sunglasses for kids boys who might prefer sporty looks or sunglasses for kids girls who love colorful frames — the key priority should always be full UVA/UVB protection and durability.

Ultimately, the best kids sunglasses combine strong UV defense, kid-friendly designs, and safe materials that can withstand all their adventures.