Superlight EVA foam grips will shave precious grams from your handlebars without sacrificing comfort.
Anyone equipping a mountain bike where shaving off every possible gram is a primary concern will love the weight saving Race X Lite grips.
The light foam material makes these hard to beat on weight, and also means they are easy to fit and comfortably cushioned.
The one drawback, and the reason they aren't used on all bikes, is that they won't last as long as the equivalent priced standard weight grips, so are probably not ideal for your daily commuter bicycle, but just the thing for your racing specced XC speed machine.