Superior function makes for radically cool form in the On Running Pant, making it hands-down the best designed running pant we've seen. The front of the pant features a Japanese ripstop fabric to fend off the elements, while the back side is cut from a comfortable 4-way stretch fabric. To further maximize mobility, the knee is designed with an anotomically constructed vent giving you full range on even the longest of strides. We love to wear ours as a technical casual pant too.