I ordered a size 5 and expected it to fit my foot well as I wear a size 4.5. But when it arrived and I tried it on, it was too tight. Therefore, if your shoe size is four and a half, order a six. (Although I still wear them. π)
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Pros
Feel like butter. The first time I practiced it, it was like magic. No blisters. Just comfort
Cons
Shoes may not have enough cushioning for active activities.