i usualy live in thongs too and wondered why my back and feet where always sore??
so off to athletes foot i went and got myself some schol (SP?) thongs they have arch support and being thong style my big fat feet still fit in them.
I usualy kick my thongs off as soon as i walk in the door but now i find myself walking around the house in them because they are so damn comfy.
they are $89 which for thongs is dear i think but they are so worth it in my opinion