Parachuting/civilian shoes

With the job as a spy comes the necessity for some crazy stunts. When some spies had to parachute from planes, they had to have special boots. However, after landing they had to blend into the crowds so they would not bring attention to themselves. This resulted in the idea of having zip-off boot tops on regular civilian shoes. All the spies would have to do after jumping was zip off the boot part on the shoes and toss them aside.