BIG SIGH - I called Urban Nature because the product listing doesn't show manufacturer nor an inert ingredient list. The answer - they kindly checked with the manufacturer who says that under Canadian law they don't have to disclose non-active ingredients and won't and that they absolutely DO NOT recommend the product for use on clothing!!
Sucks big time, I thought I'd finally found a permethrin product in Canada.
If anyone who lives close to one of their stores wants to try it out on a scrap of fabric like ripstop or sil, please note that this is 1 1/2 times as strong as Sawyer's so it needs to be diluted further than any instructions on the container.