Comfortable, breathable, thin fabric. Not bulky or knitted, leaves no marks on legs. The perfect compression for fatigue-free running and you can wear it without feeling irritated afterwards. Medium fits me perfectly (fits mom with large calves/varicose veins, usually wears M). I love that they are marked L and R which saves the hassle when you are in a hurry to move. The reflective bits are also practical.
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