This is the men's/adult version of the Finis Wave monofin. The Rapid is 30% larger in blade and footpocket size than the Wave, made of a higher performing plastic, and is designed with a high performance buckle system. The Rapid is packaged as an extreme swimming accessory. The rapid is constructed with injection molded thermoplastic for extra durability and is tapered for increased performance. Also features a Hi-tech adjustable strap, a built-in safety release mechanism, and buckle system. Footpocket is adjustable for men's sizes 9-14.