Recycled Nylon has the same benefits as recycled polyester: It diverts waste from landfills and its production uses much fewer resources than virgin nylon (including water, energy and fossil fuel).
A large part of the recycled nylon produced comes from old fishing nets. This is a great solution to divert garbage from the ocean. It also comes from nylon carpets, tights, etc.
A lot of research is currently being conducted to improve the quality and reduce the costs of the recycling process.