Insect wings are lightweight and flexible, which helps them to resist breaking. They are also covered in a waxy material that helps to repel water and dust, which can both cause damage to the wings. The veins in insect wings provide support and strength, helping to keep them from bending or breaking. Additionally, insect wings are composed of chitin, a strong and flexible material. This material, combined with the other factors mentioned above, helps to ensure that insect wings are strong enough to withstand flight and other mechanical stresses.