Anyone know what a mans size 10 is in Birkenstock, specifically these....

[soupfiend]

https://www.birkenstock.com/gb/lutry-premium-textile/lutry-265367-textile-0-rubber-u_1702.html?dwvar_lutry-265367-textile-0-rubber-u__1702_size=245&region=UK

Buying them as slippers

Any ideas anyone?

I don't understand the question - the website doesn't load, but surely there is a size chart on the website?

They are european sizes and dont have a size 10, so I dont know whether to go for 9.5 or 10.5

I personally have a 5 in the trainers but 4.5 in the boots, but Im a size 4 usually in other brands

And I should have said they call a 37 a 4.5, whereas I call that a size 4, which is why the boots for me are in a 37.

So although they have a 9.5 and 10.5 I need to know what is the closest to a 10

Is it a surprise?

They have a guide on the website there you can measure the feet to get the best fit.

If it's a surprise, you can't really do that. If it's something he knows you're getting, get to measuring him up.

Yes I'll need to measure I think

Right, its even worse now.

So his feet are 27cm long by 10 cm wide

Both sides

And when I put that into the Birkenstock size guide its coming up at a size 8 or 42

He isnt a size 8, he said he cant even remember when he wore an eight, probably as a child