yup - sensory issues are something aren't they. I've learned more about the construction of socks than I ever thought was possible. When JC Pennys stopped making the one kind of sock that my son could tolerate - I thought I was going to die. The sales person thought I was nuts. We now find the "right" socks at lands end. The toe seams cannot be at the end of the toes, they have to not exist at all or be over the top of the toes. And the underside that touches the skin has to be neatly bound - no straggler threads, lumps, or bunches.