Clark rubber have this stuff called pyramid mat. It gets used on the front of caravans to stop stone chips, comes in all different colours. Not self adhesive.
On mine, not so much for protection but non skid side of things i used what they used on skateboard decks... sticks like shit to a blanket and under wet feet you just wont slip. It comes in a roll 200 or 300 wide and buy it by the metre. the only colour ive seen it in is black.
Pj bowers do a soft grippy one as well - used this on a inflatable and it was good for the year we owned it. This one is different that it looks thicker? Ask em what they have.
Hey mate I have this stuff on my gunnels and slide a 200l esky over them every time I go out. Great stuff I have the 100mm wide roll. It's great and hard wearing. Not sure If comes any wider. It is about $100 for a ten metre roll but well worth IMO.