We’ve treated the teak with IsoGuard®, an oil that helps protect it from staining for a time and from drying out, all without obviously affecting its appearance. It won’t prevent the natural small cracks that will appear in the timber, but when reapplied over time, will keep it as well-looked-after as possible.
The outdoor canvas used to make Denham’s backrest and seat is a heavyweight off-white polyester. It’s showerproof and lightfast (so it’s unlikely to bleach in the sun) but could still stain if you leave it outside all year round. The covers are removeable though, and machine washable too.