A product fee is an upfront cost which is required for particular mortgage products. (It can also be referred to as an arrangement, booking or reservation fee). It typically allows you to benefit from a lower interest rate on your mortgage.
Our product page includes all our mortgage options with product fees, have a look at it here.
We have interest rates with and without fees that you can discuss with your mortgage advisor during your advice call, once you've had an offer accepted on a property.
Your mortgage advisor will recommend you which interest rate and fee combination is the most cost effective for you as it depends on the size of your mortgage, term and fixed rate period.