Swimrunners hand paddles are contoured to the shape of your hand. They help develop proper stroke mechanic and form while maintaining the hands' natural feel for water flow. Small holes lessen resistance and tubing won't overpower your hands. Swimrunners hand paddles is the perfect gear to gain speed and power in a swimrun race - and increase strength and endurance in training. Backside have indicaters for 40 transition, and will help the swimrunner keep track of the distance throughout the race.