Best shoes for detailing?

This may be a bit of an odd question, don’t mind me. My boyfriend is a master detailer. He always comes home with his tennis shoes and socks completely soaking wet and stinking. He one time wore a pair of my crocs to work but was told by the owner that they can’t be open toed, croc brand, or rubber. I want to get him a new pair of work shoes that will be waterproof/water resistant. He wears shorts to work and hates any shoes that go above the ankle. Any recommendations for detailing work shoes?