http://www.k2scuba.com/product_description.php?category=1&sub_cat=7&product=1389
Atomic Aquatics thought about ten steps ahead when designing the Smoke on the Water split fins. The fins are made of ultra high-energy polymer, which offers you the best combination of flexibility and strength fins have to offer. In addition to utilizing split fin technology, the Smoke on the Water fins are outfitted with Atomic Aquatics’ variable pitch Spring Strap.

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