The Head S13 includes one of the most versatile fit systems on the market.  With a 103 millimeter shell last, the fit is snug as a performance boot should be.  But, install the inlcuded SFrame inner sub shell, and the shell changes to a 100 millimeter, super snug fit.  The SFrame can also be cut and ground for a total custom fit.  There is no other boot on the market that gives you the option to actually change the volume of the shell without grinding. 

• Fits best for average to lower volume feet
  
• Very versatile fit for calf size, with removalbe rear spoiler and multi position Velcro strap

The S13 also includes Head's SuperHeat3 liner that incorporates self molding inserts into the liner and tongue.  SuperHeat3 gives just the right compromise between firmness (performance) and comfort.  The SH3 liner is even treated with Sanitized anti-microbial protection. 

Other features include: 

• Double Power vecro strap fits any leg, and can be cinched tighter with less effort
• 120/110 Flex index makes this the stiffest, non racing boot available from Head 
• Double Power upper buckles are the easiest on the market to tighten on the hill
• All micro adjustable alloy buckles for the ulitmate in fit adjustment
• Adjustable flex, cant angle, and forward lean (removable rear spoiler)
• SFrame internal shell volume adjustment
• Translucent shell material

The S13 is a top performing and great fitting boot.  Especially for the skier looking to fit in a lower volume, snugger boot, the S13 is a great choice.