I recently purchased a pair of the Belleville Hikers. I was originally looking for a non gortex or insulated hiker as my feet sweat like hell. I've been thru many pairs of hikers and I must admit, so far so good. Having purchased Bellevilles in the past and found the size to be a bit small, this is not true with this hiker. I have found them true to size and a little boxy in the toes.
It's still cold/cool here in New England (snowed today) and these hikers are comfortable. I normally wear smartwools with them yet no sweat. What I did not notice when searching these hikers was that they have vents like jungle boots on the side of the hiker which obviously allows for ventilation
I'm thinking that as warmer weather approaches, I will adjust with sock weight and continue to drive on with these hikers.