Regular fit: This garment runs true to size and has a relaxed-comfortable fit.If you’re more in the mood for fast-paced hut-to-hut treks through wild terrain than back-of-the-house strolls, the Lightning Convertible Pants are for you! The Nylon-Elastan mix makes them tough, stretchy and surprisingly soft. The durable FlashDry-XD™ technology absorbs sweat and keeps you dry at all times. And ultimately, warm. If you ever scramble over rocks, the pre-shaped knees make all movements with without complaint. And when it gets hot, the pant legs disappear in an instant in the backpack. And it goes quickly on to the next hut.