From the manufacturer

The 4-Quattro GT is designed with a slightly higher volume last to expand the fit range of the Quattro line. The GT is the warmest Quattro model, blending comfort and performance for those looking for a hybrid boot for long days on the slopes playing or working.

Features

• More accommodating fit
  Increased volume and a wider last provide a more accommodating, comfortable fit. 
• Updated footbed
  High-tech multilayer construction blocks cold transfer, ensuring maximum comfort and warm feet in freezing conditions. 

Specifications

• Size Options: 24.5 - 32 (half sizes)
• Liner: Intuition® Pro Flex GT
• Shell: High performance PU
• Closure: 4 Buckles + Finger strap
• Ski/Walk mode: Speed lock 4
• Weight Reference: 1650g; 3lb 10oz (1/2 pair size 27)
• Last: 101mm
• Cuff: High Performance PU
• Outsole: PRESA® SKI-01 / GripWalk (ISO 23223)
• Tongue: Pebax®