I love these sandals. They are super comfortable. I have 3 colors. They have several patterns in black, but this one has a logo stamp on the sole that is not plastic like the rest... it's felt or something that's dyed black, and it will turn your heels black! I own blue, natural, and now a different pattern of black that are all fine, no dye. You can tell from the pictures, if you zoom in, which ones will have the plastic logo tag... that's the one you want unless you enjoy scrubbing your heels with a pumice stone for 10 min to get dye off.