The G4 Pro Powerlock Boot is the most technically advanced wading boot Simms has ever made. It is the perfect combination of durability, comfort and on the water agility. If you are looking for the best this is it. The Powerlock Cleat system lets you switch from TPR gripping cleats (which won’t damage rafts or airplanes) to aluminum cleats when the wading gets tricky. Both sets of cleats are included with the boots.