In short, no. It requires a bit of explaining so read on!
Animal agriculture, driven by the meat industry, is certainly a leading cause of deforestation in less developed countries. The waste product of this meat industry is leather. So, until people stop eating meat, leather will continue to be a waste product that can either be used or go straight to landfill.
We have extensively tested the latest synthetic and eco-materials, and none of them currently match up to leather in terms of performance (chiefly breathability, durability and comfort). Given that current synthetics and microfibres are generally made of plastic and perform poorly whilst leather is a readily available waste product that performs exceptionally well, we are very comfortable using leather.
However, because of the impact of the farming practices in less developed countries, we only source our leather from European farms (primarily in Germany and Spain) that practice sustainable grazing.
Note: In the future, lab grown leather might well be what we use as meat consumption (and therefore available waste leather) reduces. We are closely keeping track of developments in this space.