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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
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As they are at least double the price of the cheap welding gauntlets, in say, Toolstation,
let's hope someone has done some checking.The chromium in the tanning chemicals is the hexavalent chromium,
you know, the star heavy metal contamination in the water supply in the Erin Brockovich movie.
https://www.theguardian.com/lifeandstyle/2016/sep/20/chromium-6-erin-brockovich-chemical-threatens-two-thirds-of-americans-erin-brockovich
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.