NIKE ACG Smith Summit Straight-Leg Convertible Shell Cargo Trousers

Nike's convertible trousers are inspired by Smith Rock, Oregon - the design team travelled there to get a feel for the environment firsthand. Part of its 'All Conditions Gear' range, they're made from a black shell that's treated with a water-repellent finish. Unzip the knees and wear them as shorts when the temperature rises.