Generally knit uppers won’t break in too much compared to like a leather or synthetic leather. I am not sure about Bont sizing. fizik has always ran small and narrow compared to other shoe manufacturers in the biz.
Took a punt on the 43 Bont - as they recommend their 42.5 on their comparison guide I wear a 41.5 in Fizik - so working from that, (with the 41.5 being too small) the Bont 43 should be good
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You should fully follow exactly what they recommend. They certainly do not break in at all as the carbon tub wraps up at the edges so nowhere to grow.
Hmm - I’m think I’m going to order a 44 now also if there is zero give (which makes sense) - just to get a feel on the sizing and send the wrong one back - don’t want to be in the same situation as I was with the Fizik’s…
I have Bont Vaypor S (44.5 wide) and Vaypor Plus (44.5 standard). I measured 44 standard using Bont’s measuring methods, but ended up going a half size up b/c I fit my own insole. I noticed the 44.5 wide is more comfortable with my insole and the standard is ok without socks. I don’t mold them and it’s been fine. I would be curious how the standard fits with Bont’s new insoles.
For reference, I usually wear a 44.5 in SWorks (I believe they measure 44.6) and 10.5 US in most shoes.