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The Sumi’s very pliable blade had more than one test diver noting that it felt something like a split fin, with the same pros and cons — little leg stress but quite a bit of kicking required. That split opinions on its effectiveness, between divers who wanted more oomph (“like riding a bicycle in low gear”) and those who liked the low effort (“surprisingly powerful”), but it ended up with an overall score of good for power. Even with fast kicking, the six vertical ribs on the blade top kept it tracking straight enough to earn a very good score for stability, and the supple, relatively light blade worked well for surface swimming, where it was scored very good. Though we didn’t have a full range of sizes, the Sumi’s foot pocket, softest by far in our test, helped it fi t most divers, who rated it good for comfort.