The Lightning Shorts are designed for fast-paced summer hikes through challenging alpine terrain. And when you put together summer and challenging terrain, chances are you'll work up a sweat. That's where the quick-drying FlashDry-XD technology comes into its own. It efficiently wicks away sweat helping to keep you dry and free from uncomfortable chaffing. On top of this, the nylon-elastane mix means they're durable, stretchy and surprisingly soft.