I don't think they would ever 'give' enough to be a good fit. I tried several pairs of Ariat boots ...
593343
Had to return several pairs of Ariat boot because the instep is too tight for my 'thick' feet.  I might have been able to get them on, but it would have taken way too much pull and the instep would have been much too tight for me.  I don't think they would ever 'give' enough to be a good fit.  I tried several pairs of Ariat boots and in general it seems the instep is always  tight for me.  Otherwise pretty nice looking and seem to be good quality.  Wish they fit me better.

Dan Post boots seem to have a more generous instep for somebody with my foot shape.  These fit my foot really well.  True to size or maybe a bit large.  I generally need 8 1/2 or 9, depending on the shoe and the 9's were kind of sloppy -loose so I returned a size 9  for this slightly different style in 8 1/2 , were maybe a bit large for an 8 1/2  but a good fit for me.  I'd say that's just the manufacturer's sizing differences.

These are nice looking boots and appear to be well made.  If I were to find any fault with the boots, and this is my body, the tops are the tiniest bit small, if they had 1/2 inch more circumference, they would be perfect.  I expect they will contour to my thick calves after a bit of wear.

After 4 or 5 times wearing, the boots are great, I used some leather conditioner on the boots and they are soft and easy fitting.  They seem to be conforming perfectly to my feet.  The tops, almost, but not tight on my hefty calves loosen up and fit very well after a bit of wear.  I'd buy again in a minute
2982511
I thought these boots would be a great pair of flat black boots with a level of comfort that I traditionally associate with Camper.  Unfortunately the calves were too tight (not a problem I normally run into with boots) and the snaps on the top of the boot tended to unsnap themselves.

I returned to boots because the fit just wasn't right.
176334
The boots look good and the price was right but were too small for me.  For some reason, the size was correct, but they just did not fit properly when I tried them on.
3515833
Product fits too small. I am a true 7US(38EU) with 13 inch calves, 5'5" 127lbs, I bought these boots in a 38EU (I own several other pairs of shoes and boots in this exact size that fit perfectly), but they felt like a half size too small at first... I found myself struggling to put the boot on (since there are no pull straps), only to find that once the boots were on, I could only zip it up halfway. I loosened up the laces quite a bit and was able to zip the boot up completely. Left boot seemed to fit ever so slightly different than the right boot.

I tried the boots on with and without socks.
Without socks = Fit the best! Although, the inside of the boot seemed to have hard spots where parts of my foot would rub uncomfortably. Material crinkled up around the ankle when walking. Also when walking, my foot would lift up from the heel inside the boot. Seemed like this would get annoying when walking around.
Thin athletic socks = Fit OK. Still had aforementioned problems.
Cushioned or wool socks = definitely does not fit. Feels like I'm wearing a shoe one size too small. No room to move toes around.

I also decided to see how pants fit with these boots (with no socks on).
Thin thermal baselayer or leggings= fits tucked inside the boot comfortably.
Jeans = fits inside the boot OKAY, but 1 pair of jeans without baselayer seemed impractical for my intended use of these boots.
Fleece leggings = fits inside the boot but is not comfortable. Causes the boot to feel really tight around the calves when zipped up.
Thin thermal baselayer + jeans = fits inside the boot but is not comfortable. Made it really tight around the calves when zipped up; difficult to walk around in.
Thin thermal baselayer + fleece leggings = definitely does not fit tucked inside these boots.
None of these pants options seemed viable if wearing socks taller than the ankle... Alternatively, snowboarding pants pulled down over these boots fits perfectly.

Bought these boots with the intention of using them for a trip where the weather was expected to be a snowy 15F. Didn't end up using them for this purpose, but supposedly they are rated for -22F use. So, I can't really attest to how warm they keep your feet. Decided to return these boots because of the poor fit and lack of comfort.
4327584
I did not too coextensive these to really hold a pair of boots. But holy cow- did they ever!
3549279
This boot provides very little support--no arch support, etc. Even with the addition of an insole, I have to wear really thick socks. I've worn them only a couple of times and the right boot is squeeking already.
I need a narrow width sturdy boot. Any suggestions?
1684511
It's not that they are too small, it's that the design is fundamentally flawed - with no zipper, no stretch or give, and a narrow opening, it's impossible to get these boots on.  This was true for me despite the fact that they are clearly long enough and wide enough for my foot.  Should have read other reviews before ordering!
3393349
I have small but wide feet which actually wasn't a problem (for once) when I tried these boots on. The problem was that they barely closed over my somewhat thicker calves. Understand that they're supposed to fit snugly but would've liked a bit more wiggle room, at least for stockings. Will try to alter them with my shoemaker and let him at 'em.
3757368
Didn't work with boots I bought them for - but think they may be okay with others.
2438360
For a Clarks' product, they are not as confortable as other boots they have. A bit too rigid... perhaps in daily use basis this may change...
3747121
I returned because the top of one of the boots was bent over and would not stand back up and they weren't a very good fit for me.
2044789
I have a pair a Ariat boots the same size and these new boots are more narrow and are uncomfortable. I have my shoes trees in them now to see if it will help. I am disappointed so far.
4307457
I tried these in an AU 4.5 (supposedly a women's 7-7.5) and in an AU 5 (a women's 7.5-8). I am a 7.5  in the smaller boot my toes were right up against the end. The half size up, however, felt more like a women's 8.5  way too much room, even with a heavy sock. I'm disappointed, because I love both the ruggedness and the styling of the Blundstone, but there's no way this brand is going to work for me.
1382221
Got the wide width. Still have to use thin socks to have a good fit. Leather is quite stiff until it starts to break in. Ariat sole and welt construction is excellent. Justin wide boots are wider and if you are width challenged will probably fit better.
1000776
I have two other pair of Ariat boots and simply adore how they feel on my feet. I am in the market for a dressier boot to wear with pants and thought these would be a sure thing. Sadly, no! Very-VERY- tight around the middle of the foot where your arch would be. It's odd, I often have trouble with shoes being tight at the point where the toes start (don't say 'bunion!') and these were not tight there. So, overall they had to go back---and I was quite disappointed.
1034363
One boot fit fine. The other boot seemed like it was a size smaller. Not at all like all my other ariats
342002
The boots seem to be of good quality, however I would not be able to wear anything more than a thin sock in them, and even without I feel like my feet are being squished.