It’s important to remember that:
Ski socks have a big influence on the skiing performance and the fit of the boot. Thicker socks generally limit blood circulation and provide less warmth by trapping moisture around the foot. A thinner sock will offer greater sensitivity and precision, while managing moisture better and keeping the foot dry. The sock should be dry, thin, tight and preferably made of a synthetic/wool blend. Step in your boot and while you are standing straight wiggle your toes. You should have minimum space between the end of your toes and the end of the boot.
HEAD offers, in all his line, five different lasts to ensure a performance, comfortable-oriented fit for every foot shape:
Precise: Raptor (size 265 last 93 mm-96 mm (RS))
Medium: Vector (size 265 last 100 mm)
Comfort: Advant Edge (size 265 last 102 mm-104 mm)