The prAna Women's Halle Roll-Up Stretch Pants are a popular choice among birdwatchers. Made from a blend of nylon and spandex, these pants offer stretch and durability for unrestricted movement. The fabric is also water-resistant, making it suitable for various weather conditions. The pants' roll-up leg feature allows for easy temperature regulation, while the adjustable waistband provides a comfortable and secure fit. With their stylish design and functional features, these pants are a great addition to any birdwatching outfit.