VeraCosyMen's Two-Tone Memory Foam Slippers

My partner is a size 9, should i get the 10-11 size as the 8/9 might be too small?

Has anyone bought these and not got the ones that are in the picture

I'm uk size 7-7 1/2 will size 6/7 be ok?

I got uncle width 39 and length 29 he have swollen feet please help me out thanks in advance