Colin Kaepernick's Donating 100% of His Jersey Profits

Colin Kaepernick jersey sales have EXPLODED ... and now he's puttin' his money where his mouth is, again ... by donating 100% of the proceeds he receives from the transactions.

Kaep -- whose #7 San Francisco 49ers jersey is currently the best selling jersey in the NFL -- hit up Instagram and vowed to give every dime of his share of the profit to people in need.

"I wasn't expecting my jersey sales to jump to number one because of this, but it shows the people's belief that we can achieve justice and equality for ALL!"

"The only way I can repay you for the support is to return the favor by donating all the proceeds I receive from my jersey sales back into the communities!"

This is the 2nd time this month Kaepernick has pledged to give away a huge chunk of change. Last week, he announced he'd give $1 MILLION to charity.

It's unclear exactly how much dough Kaep will give away ... but with the jerseys flying off the shelves, it's certain to be another big donation.