Your son is just as most other kids don't like any burden on their noses, so you would better to choose a frame which has two soft nose pads. Silicone may the best choice, because silicone pads tend to be softer and more comfortable. Besides, they also have a non-slip surface which can help eglasses stay in the correct position on your son's faces, as well as ensure his good eyesight. see more on ozglasses.com~