Arlie Smith has been taking donations for Costco's Miracle Balloon Campaign for UCSF Benioff Children's Hospital in Oakland.
Smith is sick himself - he has bone cancer and multiple sclerosis.
You wouldn't know it though from his superhero cape, flashy glasses and upbeat attitude.
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He kicked off this fundraiser after customers raised money for him and decided to give all that money to the kids.
"What's happening is really a miracle, that all this attention is being brought to them," Smith said.
So far, $65,000 has been raised.
Click here to donate directly to UCSF Benioff Children's Hospital Oakland in Arlie's name.