This is the best of many good wool soaps out there. The best we've used, anyway. It has lanolin and tea tree oil. Lanolin gives wool its luster and lubricity. Tea tree oil is a natural fungicide and is proven to ward off dust mites. Water-based, biodegradable, and gentle on wool. It won't strip lanolin. Use it for your jerseys, tights, tweed sweaters, and beanies. The 16oz bottle is good for ten million loads.