The belt has a smooth polished surface on the outside and a semi-smooth polished surface on the inside. This is the best belt I've ever bought online. Other straps I buy have had a rough, unpolished interior that made them difficult to put on. This belt is better than that one. It was a little longer than I expected based on the size chart, but still fits. I'm going to buy another one, one size smaller than the current one, and keep what I have. Otherwise the belt is of good quality.