Women's Birkenstock Arizona Birko-Flor Slide Sandal

I've used this cool mint cocoa butter lip balm for about 10 years! I absolutely love it. I keep one accessible everywhere, my purse, at my desk, my nightstand, bathroom drawer. I'm addicted! Nothing keeps my lips supple and moist like this balm. It is undoubtedly the best. I gave it as stocking stuffers to my family one year, and now they're all addicted as well. Every now and then I get a "bad" batch where there seems to be more cocoa butter and it doesn't glide on as easily and keep my lips moist for hours like it usually does. That just started happening within the last year or so.

Someone please help me with this if I want to order these for my son he wears 8 1/2 men's what size in these should I order