The quality of construction is great, and the material is thick (It's actually sewn as a torus, picture a fabric donut), but it's almost too tight a fit on my petite arms. I have to position it carefully to avoid long term discomfort. When worn around the elbows, as seen in the picture, it just fits, without any wiggle room. Does it stay put? Yes. Does it function as a sweat band? Yes.By petite arms, I primarily mean that my arms are short in length and proportioned differently than the arms of a taller person (I am 5'2), not that my arms are scrawny. 4 of length is a more significant portion of my arm than it would be for most men and women. I have sizing problems that average height adults don't have.