LEATHER WORKING GROUP – LWGnMatinique leather shoes have been handcrafted. Any variations in the leather are due to the nature of the material and not to be considered an imperfection. Wear with care.n 100% of the leather in this product is sourced from Leather Working Group (LWG) certified leather. The Leather Working Group’s objective is to provide environmental stewardship for the leather industry by developing and maintaining protocols that assess the environmental compliance of tannery operations. The group seeks to improve the leather manufacturing industry by creating alignment on environmental priorities, bringing visibility to best practices and providing suggested guidelines for continual improvement.