The phrase "upper tier" refers to a higher level or category of something. It generally represents a higher rank, position, quality, or status compared to lower or average levels. Full definition
In terms of credit cards, having an excellent or perfect score can be an advantage, particularly if you want to be able to earn upper tier rewards. (mybanktracker.com)
The benefits on this card tend to be the standard insurance packages offered on most upper tier cards. (creditwalk.ca)
In a nutshell, the statute states that upper tier industry members shall not have a financial interest, directly or indirectly, in the business of a licensed retailer. (fooddrink-magazine.com)