Most of the cheap welding gauntlets in the UK, which I use myself for gardening and conservation tasks are imported from Pakistan. No-one is checking the gloves for heavy metal content. Even the cheapest gauntlets are lined to prevent skin contact. https://en.m.wikipedia.org/wiki/Tanning_(leather)
Gives some details.
It may be that you have a responsible manufacturer in Canada.
Most of the cheap welding gauntlets in the UK, which I use myself for gardening and conservation tasks are imported from Pakistan. No-one is checking the gloves for heavy metal content. Even the cheapest gauntlets are lined to prevent skin contact.
https://en.m.wikipedia.org/wiki/Tanning_(leather)
Gives some details.
It may be that you have a responsible manufacturer in Canada.