That's what he has.I would upgrade to better sunglasses. Costa Del Mar and Maui Jims are my favorite brands.
Another thing that could give the sensation (that I have experienced) is one pair I have that have fairly large 580g lenses, if I’m really active wearing them for a long day, the weight on the bridge of my nose caused discomfort and it took me a couple days to realize what the issue was.I haven't used costas, but I've had that happen for seemingly no reason with others. Sometimes it's just a particular type pressed down on my ears more than others, or my eyes just don't agree with the lenses.
I've stretched sunglasses by putting them on a large cantelope. When I went to take em off, my son had drawn a face on it.Any glasses that squeeze too tightly against the sides of my head give me a headache, regardless of brand, I have an old pair of raybans I love, I had to file down the mating surfaces of the hinges to loosen up the fit on my head