The mosquito net

There lived a man named Jack who lived with his wife.
One day jack told his wife to buy a new net , she listened to him and went to the shop if she could see any mosquito net, the owner Lead her to the net store and showed her a good net, the owner said that not even a single mosquito can pass through it and she asked her to buy it but she refused it then she said if not even a singles mosquito can pass through it so how can we pass through it, so she went back home to explain the problem to her husband,he laughed at his wife foolishness.
His wife was sad,then she realize her mistake.