Here's the rub. These are tremendously comfortable sandals. I had two pair, wore one out and bought these. I still have two pair. All of them were Size 8 M ...Now the dilemma. My feet are a size 9D. but I have been wearing these size 8 sandals for years. Walking outside, on the treadmill, hiking, on the beach, in the ocean (the nylon canvas not the leathers) When I had to order this new pair I naturally ordered the same size as what I have been wearing for at least 3 years. They were made in Viet Nam. These in China. They have the Memory Foam which to me was the saving grace and very important. I am a Podiatrist. Here's the suggestion. It's all in the way you adjust the straps. If they are too loose , your foot will slide forward and your toes will hang over allowing them to be traumatized while walking. If you make them too tight and during the day you get what is called "Dependent Edema " or swelling by gravity, they will become too tight. SO, use your head, adjust them a few different ways. Wear them in the house for a while and if you need a different size...get them exchanged. As a Size 8, these are a little smaller uppers than my other 8's were so I adjust them accordingly. The foot bed is the same but the straps are a little different. On these Chinese made sandals, I have to adjust the straps a little larger. Your toes should be just a little back from the front edge to prevent foot trauma so check the way they are adjusted for YOU . Everyone is different. Remember , burning feet can be not only from the material on the sandal...it can be from Circulatory problems or Diabetes or many things. If you experience any problems that feel different than you would expect. Go to your doctor and explain it to him or her.  I would rather walk in these than walking shoes. I chose them because they have the exact same configuration on the foot bed and sole, as my sneakers that I was most comfortable in while walking.

SENIORS..Do not buy "Aggressive" soles like these on any shoe or sandals if you shuffle your feet when you walk. You will fall. Buy a less aggressive tread, padded sandal . In other words , smoother but not slippery leather bottoms. Because each person is different you need to experiment with what is good for you. Some people can't tolerate leather under their feet but others can't tolerate synthetics. Just be smart and look at all the factors. When you find one that fits correctly and does what you want it to do for you, stick with it. If it works , that's all that counts for YOU.