These were leather mitts with one finger(index) used by chainsaw operators,bush workers,hunters,trappers and many outsdoormen/women
I first heard the term home in Northern Ontario while working in a clothing store.

(See Snot Liners)
The wearer did not have to take his mitt off to wipe his runny nose-he had more control-hence came the name-Snot Leathers!
by KING ARTY February 22, 2012
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