Columbia Men’s Convertible Backcast Pants Blue Medium inseam 34 100% nylon in a textured poplin finish, lightweight, comfortable, and durable, no matter the weather or activity. The interior mesh brief offer wet or dry use while the protective exterior features UPF 50 to help block and shield from UVA and UVB sun rays. Durable, comfortable, and versatile - with two zips - go from pants to wading in shorts instantly. Machine Wash.