Hi, I am thinking your shoes were too small. They need to fit fairly snug across the top with room to wiggle your toes and your heel will be loose. Personally, I like thicker socks with mine. Also, do not buy and wear to work unless you have worn these before. Buy, wear for an hour or two the first day and go up from there. Also these shoes do not work for everyone. One store I know of sells these but uses caution because of that fact.