Oakum
Oakum is a preparation of tarred fibre used to seal gaps. Its main traditional applications were in shipbuilding, for caulking or packing the joints of timbers in wooden vessels and the deck planking of iron and steel ships; in plumbing, for sealing joints in cast iron pipe; and in log cabins for chinking. In ship caulking, it was forced between the seams using a hammer and a caulking iron, then sealed into place with hot pitch.
Tuilik
The tuilik must seal reasonably at the face and kayak cockpit coaming, and usually at the wrists. This is done using smooth, stretchy, grippy materials. Both laminate fabrics and neoprene will seal, but stretchier neoprene often seals better, so some non-neoprene tuiliks have neoprene rands. Stretchier neoprene with one smooth side may grip and seal better, so even neoprene tuilikusaqs may use a different neoprene for the seals.