Ben Affleck dons 'Detroit' hoodie to pick his kids up from school

He's a proud Bostonian.

But on Friday, Ben Affleck repped Michigan's largest city instead when the actor picked up his kids from school in Santa Monica.

The 46-year-old Gone Girl actor slipped a maroon 'Detroit' hoodie on over a t-shirt for the Friday school run.  

Detroit proud? On Friday, Ben Affleck repped Michigan's largest city instead of his usual Boston when the actor picked up his kids from school in Santa Monica

Detroit proud? On Friday, Ben Affleck repped Michigan's largest city instead of his usual Boston when the actor picked up his kids from school in Santa Monica

On his lower half, the Argo director wore a pair of simple gray sweatpants.

Blue sneakers completed the casual look, as Ben escorted two of the kids he shares with ex-wife Jennifer Garner -Seraphina, 10, and Samuel, six- to his waiting SUV.

Their eldest daughter, Violet, 13, did not appear to be present.

Watchful Ben: The 46-year-old Gone Girl actor slipped a maroon 'Detroit' hoodie on over a t-shirt for the Friday school run

Watchful Ben: The 46-year-old Gone Girl actor slipped a maroon 'Detroit' hoodie on over a t-shirt for the Friday school run

Gray day: On his lower half, the Argo director wore a pair of simple gray sweatpants

Gray day: On his lower half, the Argo director wore a pair of simple gray sweatpants

Sneaky: Blue sneakers completed the casual look, as Ben escorted two of the kids he shares with ex-wife Jennifer Garner -Seraphina, 10, and Samuel, six- to his waiting SUV

Their eldest daughter, Violet, 13, did not appear to be present

Sneaky: Blue sneakers completed the casual look, as Ben escorted two of the kids he shares with ex-wife Jennifer Garner -Seraphina, 10, and Samuel, six- to his waiting SUV

Affleck has officially retired as Batman.

Appearing on Jimmy Kimmel's chat show on Thursday night, the actor explaining he felt it was time to 'pass on the bat torch'.

This being Kimmel, there was quite the send-off, with the chatshow host deciding to 'officially retire' Affleck's bat cape, with his usual mocking take on the idea.

'Warner Bros. has given us something. We're going to officially retire your Bat-cape to the rafters,' he told Ben. 

His tresses: Ben rocked his usual salt and pepper locks for the outing

His tresses: Ben rocked his usual salt and pepper locks for the outing

Hooded: Affleck lifts his hood to protect himself from the drizzling rain

Hooded: Affleck lifts his hood to protect himself from the drizzling rain

Meet Batfleck: Ben Affleck officially retires as Batman on Thursday night, before Jimmy Kimmel mocks his love of Tom Brady with a number 12 Batsuit

Meet Batfleck: Ben Affleck officially retires as Batman on Thursday night, before Jimmy Kimmel mocks his love of Tom Brady with a number 12 Batsuit

He then brought out a rather unusual version of the famous cape, which on the back said Batfleck in gold lettering, with No 12 beneath.

'That's Brady's number,' said Ben. 'You can't be a hero unless you wear number 12.'

Ben then joked that Warner Bros paid a

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