Each hand and arm is different, there is no Regular sizing when it comes to compression sleeves. For that reason this past month we have eliminated our "Regular" arm length name and have renamed it "Long". After running reports we have found that more than 50% of our customers were better fit for our Short length sleeves but many of them initially purchase the Regular length. We didn't want anyone to be suffering with an ill fitting sleeve they have to pull up or roll to feel comfortable in. We wanted to make sure each and every one of our customers was buying a sleeve that would be the optimal fit for their arm, so by renaming the Regular length to Long, we hope that it will encourage our customers to actually measure their arm and determine whether they need a Short or Long sleeve. Neither of those names implies that you have T-rex arms (Short) and Octopus tentacles (Long), all it means is that a slightly shorter or a slightly longer garment would be the most comfortable fit for you, we could have just as easily named these Length Option A and Length Option B, but that would probably be even more confusing.