Excellent for both horizontal lap swimming and vertical aquatic fitness classnDesigned to maximize resistance to build upper body strengthnErgonomically engineered shape for improved grip and reduced hand fatiguenOval flow-through holes increases feel for the waternSpeedo Biofuse flexible comfort paddles. Designed to maximize resistance to build upper body strength. Adult, one size. Swimmers 15 years and up. Biofuse technology: Blending maximum comfort, fit and performance. Ergonomically engineered shape for improved grip and reduced hand fatigue. Oval flow-through holes increases feel for the water. Excellent for both horizontal lap swimming and vertical aquatic fitness exercises.