Ask the supplier to invoice it correspondingly on the customs documentation.
At the risk of busting the frisson of pushing the boundaries, latex is not in general illegal, and the authorities are not interested in the somewhat risqué. Of course, there are obvious exceptions, but even there the latex is almost always an innocent collateral aspect of what is at offence. If they're not hassling the importers of corsets, say, why would they hassle you for goods being imported for personal use? You have a right to a private life, and if some public servant breached it, you'd probably have a good case against them. But in general, Canada's very broad-minded, some of the most public displays have been filmed in Toronto, so I'd suggest you shouldn't fret - but like I said elsewhere here, ask on the IAR, as a goodly number of their members are Canadian, and quiet a few from your neck of the woods.
