Not great arch support but there is an arch on the inside of these. I can't even wear regular flip flops or sandals anymore because they have no support. One complain with these is that I wear a size 7.5 or an 8 shoe (depending on the brand) and I have to buy a size 7 with these. Sometimes they don't fit correctly so I took a chance when I got them here on Amazon. These did fit and I wear them all summer long.