Stretch Zion Convertible Pants - 30 Inseam 28 - Dark Khaki. The prAna Stretch Zion Convertible is the ultimate be-prepared pant. Stretch Zion fabric is water resistant, quick drying, and abrasion resistant- ready to splash through mud and do some impromptu bouldering. A ventilated free-range gusset helps you breathe while allowing complete freedom of movement. Adapt to your environment by zipping legs off to short length when the sun rises high and hot.