Decades ago, Nike famously used a waffle-iron design on the sole of its running shoes to revolutionize that athletic footwear category. Today, it is employing a similar pattern in its newest premium golf ball line, dubbed RZN (for resin), and hoping that it has a significant impact in that realm as well. The key technology in this franchise, which includes the RZN Platinum, Black, Red and White models, is the Speedlock core. It features a surface similar to that of a waffle iron that allows the resin core to interconnect with the compression layer to form a tighter bond. According to Rock Ishii, senior director of golf product development at Nike Golf, that helps promote better energy transfer through the layers at impact by eliminating the slipping that he says normally occurs between a traditional smooth-surface core and the outer layer. “We knew we hadn’t pulled 100 percent of the energy that we could out of the initial RZN core, which we brought out in 2011 with the 20XI ball,” Ishii says.