There are two standard types of protective chainsaw trousers, Type A and Type C.
Type A Chainsaw Trousers
Type A chainsaw trousers protect only the front of the legs, and can be supplied as chaps, worn over conventional work clothes, or as conventional trousers. Type A chainsaw trousers are worn by chainsaw users working on the ground.
Type C Chainsaw Trousers
Type C chainsaw trousers give protection all round the legs and are almost always worn as ordinary trousers, not over another garment. Type C chainsaw trousers are most commonly worn by arborists, to provide them with maximum all round chainsaw protection when climbing and operating the saw in awkward positions. Some training organisations insist on students wearing Type C protection.