Entry level beginner or recreation skates (skates with rivets) are not adjustable. Most skates above beginner with screws are adjustable. The blade is mounted to the boots with screws and they have temporary mount holes that allow the blades to be moved inward or outward laterally. For supination we move them to the outside by 5mm or however much is required to glide straight without catching an inside edge and the opposite for supination, the blade is moved to the inside so the skater doesn't catch an outside edge when trying to glide straight.
Look at the bottom of the mid-level skates you are planning to buy and if they have screws, typically they can be adjusted. Generally, the boot also is leather on the base where the blade plate meets the outsole. This means if significant adjustment needs to be made to the skate blade location they can be plugged and remounted. It is always better to have someone who understands skating and how the boot and blade work on the ice mounting and adjusting the blade. If you wish to take this on yourself there will be a lot of study required past adjusting the temporary mount screws.
The Jackson skates starting at the Fusion series are all completely adjustable[ the step below (Ascend series) are technically adjustable but have PVC outsoles and plugging for full remounting is more complex.
With Rieddell, the skates are fully adjustable starting at the diamond and up in the competitive series
It is important to point out every skate brand uses different measuring and sizing. For example in women's a size 8c/d in Riedell typically fits a 9½-10 wide in women's USA street shoe depending on if you want a comfort or competitive fit. In Jackson the size would be a 9 or 9.5D. It is all based on their proprietary measurements. Edea, we have found, for example, don't fit wide feet ever, and their sizing is in metric plus 1.5cm or 15mm. So always check the manufacturer's size chart for the specific model. Even some models size differently in the same company.
