Colin Kaepernick dons 49ers cap

ESPN The Mag Body Issue 2013: Colin Kaepernick (4:47)

Colin Kaepernick explains why he wants to be different, why he's uncomfortable with his celebrity status and why he thinks about the Super Bowl loss to Baltimore everyday. (4:47)

Quarterback Colin Kaepernick responded to fan and media criticism after he wore a Miami Dolphins cap when he was celebrating July 4 by posting a photo on his Instagram account of him wearing a San Francisco 49ers cap on Monday.

It marked an apparent change of heart for Kaepernick, who had earlier refused to apologize for wearing another team's hat.

On June 5, he responded to backlash on social media by posting a photo on Instagram of him holding the Dolphins cap with a smirk, asking, "This the hat y'all mad at?"

"I'm goin wear what I want regardless of what you think, all you need to worry about is the fact that I grind for my teammates and the 49ers! I plan on doin this until they won't let me in the building!" he wrote, adding hashtags of #ridiculous and #y'allmustbebored.

Kaepernick, 25, took over as the 49ers' quarterback during last season when he replaced Alex Smith and led San Francisco to the Super Bowl. He finished the season throwing for 1,814 yards with 10 touchdowns and three interceptions. He also rushed for 415 yards and five touchdowns.

He told ESPN The Magazine for the recent Body Issue he's determined to prove he can sustain that success now that he's the 49ers' unquestioned starter.

"A lot of people say last year was a fluke," he said. "They say defenses are going to figure out how to stop our offense, and we can't do it again. That constantly drives me. Any time I'm told I can't do something or told someone is better than me, that motivates me to prove them wrong.

"It doesn't matter what I'm playing -- tic-tac-toe, chess, Monopoly -- I'm playing to win. I don't want last season to be an outlier. I don't want to be one of those players who had a good year and comes back and has a bad one. I want to be similar to the Tom Bradys of the world -- every year you get a great year out of them. They go out there and perform at a high level."