One each of the Boomerang and Gecko gel nasal pads, to let you try them both out and see which one works best for you.

Most common size for the Gecko for most is the Small, though you can always cut a larger pad down to size.

Most common size for the Boomerang for most is the Medium/Large.

Pick the size choice based on what you think you need.
Choices are Large   &  Medium/Large, Large & Petite/Small, Small & Medium/Large or Small & Petite/Small