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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.
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I've used these for a couple of years, and ain't dead yet (though the heavy metals point hadn't occurred to me - I presume they're food safe...):
https://www.bakerybits.co.uk/professional-leather-oven-gloves.html
Hm, hadn't thought of that, you really think there might be a transfer of chemicals/heavy metals to food?