Ehh I'm more of a Birdman fan. If you are more of a Michael Keaton as Batman kinda guy, then these classic Batman boxer briefs should get your engine
Batman Classic Men's Underwear Boxer Briefs- Medium (32-34) Black
Boxer Dc
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Underwear Superman Clothing
Men's Adult SpongeBob SquarePants Boxer Brief Underwear 3-Pack - Bikini Bottom Comfort- Small Multicolored : Clothing, Shoes & Jewelry
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Men's Underwear : Page 14 : Target
DC Batman 3-Pack Adult Mens Boxer Briefs, Sizes S-XL
Sleepwear & Robes, Men's Clothing, Men, Clothing, Shoes & Accessories - PicClick
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Bioworld Men's Adult Batman Boxer Brief Underwear 3