This Under Armor Links Short has an elastic waistband. In addition, it has UA storm technology and is water resistant.
-Tight fitting: Close to the skin, but not too tight
-UA Storm technology is water-repellent while retaining breathability
-Light, abrasion resistant woven stretch fabric provides ultimate comfort
-4-way stretch fabric for greater freedom of movement in all directions
-Moisture Transport System wicks away sweat and dries quickly
-Elastic waistband always has the ideal fit thanks to pull elastic
90% Polyester/10% Elastane