The ad said, "Believe in something. Even if it means everything is sacrificed.
Martin knew that Nike boycott would hurt.
"Being a sports shop without Nike is like a gas station without gas," he said.
"It was never my property.
Martin said the boycott was about the principle of profit, and even if the lost revenue played an important role in deciding to close the store, he was completely pleased that he did it.
"men who gave Colin Kaepernick and me the right to speak freely," he said.
Nike's solution to use the 30-year-old Just Do It Kaepernick campaign, outraged by some sports fans, including Martin.
In 20 years of business, Martin said he was thinking of himself as a guy who sold the sweaters, not as an activist. He had never boycotted anything before, though in 2016 He canceled Brandon Marshall's autograph appearance after Denver Broncos player took the national anthem before the game. He decided to tell his nine employees that it's time to call him a career. Everything in the store is 40% off.
Other shopping center stores, including Sears, are closed. The shopping center is smaller.
Martin told the CNN affiliate KOAA that his sales were also affected by people buying more goods online for retailers. Its sales have fallen by 15% over the last three years.
The shop will be open until everything is over, he said.
"I didn't make big Nike and big dollars. I didn't. I did it my way, ”he said at Colorado Springs Station.