Is Leather Waterproof?
Leather has some water resistance, but is not waterproof without treatment. It is important to remember that leather is permeable in nature - so too much water will cause it to become wet. Once wet it is important to dry out the leather (click here for more information on how to do this) as it can begin to rot.
Water resistance means that it is naturally able to resist some penetration of liquid, but will not repel it entirely. As an example, it will stay protected in a light rain shower, but anything more and it may not have adequate protection.
This is in contrast to waterproof materials which can be submerged in water without being damaged. Using treatment products such as water and stain repellent and leather conditioner can allow leather to be submerged in water without being damaged, but the barrier these create are temporary and therefore the leather will only remain undamaged if fully submerged in water for a limited time.
It is important to note that due to the permeable nature of leather it can never be truly 100% waterproof !! This is especially true as the leather ages and is left untreated. The good news is that if leather is treated in a specific manner you can not only increase the lifespan of your leather, but also improve its waterproof level.