The spectacle is not a lightweight, but quite stable. My daughter 2,5jährige you could not destroy after two weeks ;-). Even the strong bending of the clips outward could not harm the goggles. You "glasses" are fine you protect the children's eyes -lt. Description- 100% from UV rays. In terms of size, the glasses will fit perfectly well from the age of 3. My 6 year old son to fit also very good! For the price you can not go wrong. If the glasses will buy again.