The trick was to invent a loop that the hook could catch onto. With stiff hooks and soft loops, de Mestral would have the basic components of a fastener that people could use on their clothes. However,it took a long time to perfect his invention.For eight years, he experimented and perfected his invention, which consists of two strips of nylon fabric.One strip contains thousands of small hooks.The other strip contains small loops. These tiny hooks and loops were attached to a strip of nylon.When the two strips are pressed togerther,they interlock and form a strong connection. With the help of a weaver from a textile factory in France,he perfected his prototype. the nylon hooks were manufactured and sewn under a special infrared light. In this way, the hooks perfectly matched with the nylon loops.