The plastic triangle isn't bad, but since I do rough mountain biking with it and do other things they're not necessarily designed for, the triangles leave a slight temporary bruise on my leg (no pain or discomfort at all). If you just walk or hike, no problem. These are great sandals and have received many compliments on how comfortable they look and how vacation-ready they are. My favorite sandals I've ever had. I will buy again!