That's where the "demanding " part comes in. I learned to dive in Cape Town with 8mm suits, big steel tanks and weight belts for days. I'm so glad I get to do the rashvest thing exclusively now. 400m icy path? I'll settle for Netflix and a ciggie thanksThat's what I thought, as an avowed warm water rash vest diver, until after a dive at Silfra last month when I had to slog up a 400m icy path post-dive in a dry suit with all the trimmings (including 16Kg of lead). And I haven't smoked for 20 years now!