||I have several pairs of roller blades and ideally, I will replace the stock liner with one of these in each one. I cannot begin to explain how much these liners change the boot. Fantastic. They improve fit, they improve gait, they improve ankle comfort and flexibility and more importantly your whole skating experience.
The downside is the price. These alone cost as much as a pair of basic Seba's but wow, the different. I've now got two of these liners and use one in a SEBA FR1 setup and the other in a Rollerblade RB80 setup.
My advice and I wish I knew this before hand, if you're a rollerblade junkie like me, hold off on buying a new set up or pair of blades, get these liners.