Vegetable tanned leathers are not waterproof but some are water repellent. Last week I wetted this elmc roadstar with a spray bottle. 5 minutes later the water was still in droplets / puddles on top.
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I only took an 'after' pic lol.
OH man. Never got caught in the rain or even tried wetting my jackets. I live in an apartment building so finding a place to dry out a jacket for a few min without coming back to it being gone is almost impossible .