What size should I get for men's 11.5
67297
Large. I wear a size 11 mens, and I ordered a Large size gaiter. They fit well.
1614795
I'm not sure my guy wear 11.5 and works well sry I couldn't be more help there isn't much more room about 2 inches
1334798
Get him an 11. If he plans on walking long distances then he needs to try them on before he buys.
935051
I wear a women's size 7.5 and I got a medium. I would NOT want it any tighter so I would think you need a large. Hope this helps!
758621
I wear 11 in Adidas and 11.5 in Nike since they run narrower than usual. I ended up buying the size 45 and they fit me great! Hope this helps!-Amir
950322
Get medium. They run small. I wear size 8.5 and medium is very snug on my feet.
536910
I bought a size 44 for my husband who wears a size 10, so I'm guessing you would probably need a 45.
796567
Your husband may want to get the larger of the sizes, the 11 - 13 size. I see in the reviews that some people had problems with the inserts slipping around in their shoe. This problem may not come up if the insert is a larger size and fits more snuggly in the shoe.
202740
I think medium will work. My husband has large and he wears 10 or 11 in shoes. I have medium and I wear 7 1/2 to 8
648047
I am an exact men's 11 shoe size. The "G" fins fit me perfectly. (FYI, I have normal-to-narrow feet).
279622
My Husband wears an 11 1/2 and they have to go on an angle. It takes up a little more room, but we can get them to fit.
272180
I also use these with boots, mil spec size 9 and a large works well with that size. I would have to say with a 11.5 I would goto at least an extra large
90892
I ordered an X-Large 5mm to wear with a size 10 1/2 shoe and the fit is a bit tight. The 5mm thickness is OK for a size 11 men's shoe anything smaller I would suggest the 1.5mm neoprene sock. I've worn both sizes (with different boots) for Washington state surf and salmon fishing; they work great.
1677638
I wear size 10.5 to 11 men's show (European 45) and size XL is perfect but has a little room in it. I would say a L should work unless you like your socks really tight fitting.
25242
They run a little bit small. I wear a 10-10.5, and the Medium fit me snugly. I'd suggest medium.
542711
This should help, I found sizing on a different site Grip-Ons Sizes: Medium: Men's 5.5 - 7 or Women's 6 - 10 Large: Men's 7.5 - 10 or Women's 10.5 - 13 X-Large: Men's 10.5 - 13 or Women's 13.5 - 16
311259
I would strongly recommend a medium I have a mens size 10 and i bought a large. its a bit big on my foot.