For 500 Slayer reward points, you can learn how to add rings to your slayer helmet. This will allow you to add Rings of slaying or Ferocious rings to the helmet granting the ring's teleport benefits. This will change the helmet into a Full slayer helmet (f).
Any version of the helmet can be recolored at Solomon's General Store for 4,000 Loyalty points.
You can spend 100 Slayer reward points to upgrade your slayer helm into a Reinforced slayer helmet. To do this you must be wearing the helmet when buying the upgrade. If you lose or destroy the upgraded helmet you will need to spend your slayer reward points again.