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The My First Shades sunglasses are designed to protect a child's eyes from harmful sunlight, and be exceptionally durable. Children's eyes are especially vulnerable to the damaging effects of uv and bright light. The lenses and frames are nearly indestructible polycarbonate. The lenses block 100% UV. The frames are held on with an adjustable neoprene strap. Fits children from 3 to 7 years old.