These trousers are a wool and nylon combination. They are very classic in their style. They were worn as a middle layer in the service. In the coldest of weather when troops were out on the field, they wore a layer of thermal underwear, these wool trousers and then a field pant to keep warm. They are a typical straight leg trouser. They are offered in olive drab green(ARMY) and an evening blue(RAF). The green is a flat front waist with a brass zip front. The blue is pleated with a button fly. They are excellent outdoor pants, yet by the classic look of them, they can be worn as a casual look as well. Please specify your color of choice.