> Wool has a protective layer of grease Right, it's called lanolin. It's also true that lanolin + shade and rain cover is better than lanolin alone. No protec

> Wool has a protective layer of grease Right, it's called lanolin. It's also true that lanolin + shade and rain cover is better than lanolin alone. No protection is 100%. > degradation that you see on sun-damaged clothing is mostly on the dye "Mostly." We agree damage is done to the fiber. ;) By design, modern dyes often act to protect fibers, soaking up energetic photons before they can damage the fibers themselves. In their absence, undyed fibers can be more susceptible to damage.