Flameborn 
Pocket Heater
Consumables Uncommon
After ignition the leather limits the amount of air around the coal, causing it to burn slower. This will keep you warm for a bit.
-
Crafted by Hunter - You get
×3
Crafting
Ingredients
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Coal
×1 -
Metal Sheets
×1 -
Reptile Leather
×1
From the same artisan
Hunter · 178 recipes
Source: see “Pocket Heater” on the Enshrouded Wiki (enshrouded.wiki.gg, CC BY-SA 4.0)