i would like to take this time to pay homage to the best fins i ever owned. BZ rubbers. they are not made anymore, and i cannot find them in my size (large). the ones i have been using for years started to crack and fall apart. then one day i heard about sponge rez. i poured that stuff all over them, in the cracks and around the drainage holes where it was actually just ripping open. it did the job, and now they are good as new. i cant say enough good things about sponge rez. i bought a couple extra tubes for when i need more down the road, just in case it stops getting made as well.