etnies - Sentry (White/Navy/Gum) - Men's: Following its predecessor the Response, the Sentry is the second shoe in the etnies line equipped with System G2 technology (and the first with G2 and a polyurethane midsole). System G2 is a gel air compound that cushions the extraordinary impacts from jumping off huge objects. To make a long story short, you get all the protection of an air system with much less thickness and a whole lot more board feel. No matter what kind of danger you encounter, the super-lightweight Sentry will stand guard over our feet. Action leather upper, lower hidden lace loops. System G2 Air Gel System inserted in heel provides superior shock absorption, and allows for supreme board feel. As you forcefully land hundreds of times a day, System G2 will not bottom-out and it will protect your body better than any other cushioning system. Padded tongue and collar, strobel construction for ultimate fit. 400 NBS rubber outsole.