The material changes from the toe box area to the rest of the area where your foot rests. It's always bothered my feet but last night's walk to dinner was a different story. We only walked half a mile there and back, but I think perhaps my feet were a little swollen because I have three discrete blisters and a couple of hot spots.
These sandals won't be making the trip back home tomorrow. I'm just glad I have a pair of flip flops I can wear