A good fitting ski boot is a very difficult find. In today's market, ski boot manufacturers use only a few lasts that must mould to a person's foot type.
After evaluating a large majority of the skiers, it has been found that as many as 70 percent overpronate. This overpronation causes inward rotation and excessive flattening of the arch, placing strain on the muscles, tendons and ligaments of the back, hip, thigh, leg, knee and feet. As the condition continues, it leads to arch fatigue and strain.
A tell tale sign of pronation is the ankle bulging inward against the ski boot. When skiing with this problem, there is a tremendous loss of edge control for turns and efficiency. The pronation or forward rolling of the foot in the boot can lead to a neuroma (nerve impingement between the metatarsals that become compressed by the metatarsals) causing painful burning-cramping pain.
The skier with a wide foot will complain of bony enlargement, which causes pressure and irritation against the ski boot. The most common areas affected are the inside of the ankle bone, the top of the foot, the metatarsal bone on the side of the foot below the small toe and the back of the heel. A custom made orthotic insert will give perfect biomechanical control between a foot and ski boot. This will increase efficiency and reduce complaints of foot, ankle, knee and lower back problems; the skier will regain his maximum edge control for turns and parallel skiing.
Some skiers may want to try an over-the-counter foot bed inserted into the ski boot. I have found Spenco to be one of the more superior products to allow for painless skiing.