I’ve got a pair of Scarpa SL’s in wide fit. They are a few years old now, bought 2010, and generally I only go out in them if I expect to have to don crampons.
I bought a pair of Altberg Tethera in wide fit in 2016 and really like them. First boot I’ve had that I felt fitted properly.
This year I bought a pair of Altberg Nordkapp in A-Form fit to break in as my Tetheras are getting fairly well worn now. It’s wide at the front like my Tethera but has a narrower heal, so far I think it’s working well for me.
Basically the Nordkapp Tethera and the Kidson are different versions of the same thing. They are made using different lasts.
If you click on each boot on the web site and then click on features you’ll get description of the fit.
The Tethera is the standard Altberg last – available in half sizes and 5 width’s.
The A form is described here -
https://www.altberg.co.uk/a-forme/ and available in half sizes.
The Kidson is G fit which is extra wide with extra volume.
I’d describe these boots as on the stiff side for 3 season boots, they are not approved for but will probably take a flexible crampon OK. They are sturdy boots.
The Scapa is significantly heavier (the Altbergs are surprising light for traditional leather boots) and stiffer. I don’t know if they still do the wide version.
Hope that helps.