Lanolin Wool by Dale is a 4-ply 100% wool yarn that preserves its original properties. Lanolin, which is added after the dyeing process, increases the elasticity, the thermal and insulating properties as well as the self-cleaning and water-repellent features. This is why Lanolin Wool works great for underwear, socks, garments for kids, and clothing that can be worn outside. NB: The lanolin is gradually rinsed off of the projects with every wash, we recommend you use a specific wool detergent with lanolin to preserve it.