WARP WARP FIN Advanced Long Blade Full Foot Fin Unlike other colors, black or white models have higher rigidity, providing more powerful propulsion than Super Mews, making it easier to move forward, especially during boat diving. I used these fins about three times with the Mew Boots I'm also selling, but the boots didn't fit, so I'm selling the fins to buy a different size. Also, I did not wear them by folding down the heel. There is some slight yellowing and some dirty spots, so please check the photos. There are no cracks in the rubber.