J. Griffinwrote a review of Simms G3 Guide Boot - Men's on June 28, 2016
Familiarity: I've put it through the wringer
I have the previous version of this boot, but due a careless thawing incident involving frozen boots, I warped one of them causing some discomfort on one foot. I decided to pony up the money to replace them and I didn't expect the new version to be much better.
I was quite wrong. Simms really have improved the G3 Guide boot. There is more volume in the boot I've found, which might be a bonus in winter time. Although there is more volume, I didn't have any issues with my feet being loose and my heals feel better locked in place than the previous pair. With the reinforcements, I think these are more bomber than before too.
On a recent trip to Montana and Colorado, my feet never got tired, even on days we were on our feet for 10 and half hours straight...