Lee Valley dose not advertise it as such but their canvas shop apron saved me from kick back injury. I'm sure they can't advertise it as such because of liability issues. I can comment on it though.
I wear eye and hearing protection as well as the apron. I was making a stupid cut when it kicked back striking me in the sternum. It knocked the breath out of me and almost stunned me.
The double layers of canvas in the bib of the apron never even ripped. I suffered no bruising, no cuts and no penetrations. The canvas was not penetrated either.
I'm sure Lee Valley can't advertise it as such, but it sure made a believer out of me that it is another layer of protection. I'm glad they use a strong canvas.
I'm embarrassed to post this, but it might save someone else from injury.
I bought the apron because of the shoulder strap configuration.