Your ski boots are the most important part of your ski equipment. Period.
You transmit power and provide direction to your skis through your boots. The better the boots match the anatomy of your feet, the easier it is for you to control your skis and the better you will ski. The added bonus is that your feet will also be more comfortable and warmer because you won't have any pressure points or cut-off circulation. And, when you are comfortable and warm, you should enjoy skiing longer. Investing in a great pair of ski boots is worth every penny!
for skiers with shorter Achilles tendons who need a split cuff for easier flex
for high-speed skiers who want a stiffer boot
for very strong, athletic skiers who want the stiffest boot