Hypoallergenic materials, safe for children with sensitive skin or allergies. Additionally, they can be mouthed without risks to the child's health. Curved Temples Ergonomic profile for good facial and head grip. Cord Attachment: allows attachment of a cord. Thanks to its sturdy metal construction, this hinge lug significantly reduces the risk of breakage during handling, especially by children. Its increased strength ensures superior longevity for the sunglasses, even with heavy use.