Oddballs and Goolies

I was looking on the Wigan Warriors shop for a couple of beanie hats for my grandsons. Can anyone tell me the meaning/relevance of 'Oddballs' and 'Goolies' across two of them please?

Think its a cancer charity that does underwear and stuff. Maybe a certain amount goes towards the charity.

Thank you, sounds right. Not to buy for the grandchildren though, I think.

You're welcome. No I wouldn't think it would be appropriate...

I've now been told by someone else they think it's something to do with prostrate cancer.