These are not hollow. So I started looking at cheaper options, and this one came up recommended in a few places. I like them a lot! Admittedly, with genres like rock the mids can get losts and sometimes depending on the mix the vocals can get lost, but, there are CHEAP! Just for an experiment I wore my asic running shoes for one hike and discovered that the bottoms of my feet were hurting due to stepping on rocks. Does it do the job? Yes. Returned this to the supplier, ended up paying for return. ) So glad that FitFlop decided to make this prettier variation. I got these shoes yesterday (black, size 7). I decided to buy them on Amazon because they were no longer stocked at the store.