Anquan Boldin praised the pure quarterback abilities of Colin Kaepernick.

"From the outside looking in, you hear about how athletic he is," Boldin said. "A lot of times, the quarterback aspect gets overlooked. I think if people have a chance to play with him or see him up close, they'll understand how good of a quarterback he actually is."

Kaepernick and Boldin are building their chemistry.

"That is just a trust thing," Boldin said. "I think the more you do it and the more the receiver comes through for you, the more you trust him. We haven't been in that many situations where we could work on it.

"As a receiver, my thought is, every time a quarterback throws the ball to you, the more times you complete the pass the more confidence he'll have in you."