The oldest of these date back 4600 years. We use them every day and the modern variety is abundant. What are they?

A: Leather Shoes

The earliest known shoes are sagebrush bark sandals dating from approximately 7000 or 8000 BC, found in the Fort Rock Cave in the US state of Oregon in 1938.[5] The world’s oldest leather shoe, made from a single piece of cowhide laced with a leather cord along seams at the front and back, was found in the Areni-1 cave complex in Armenia in 2008 and is believed to date to 3500 BC.[

Today's question is

This industry was dying and almost disappeared. Now, with the pandemic, sales of this product have never been higher. What are they?