Garmont lists its sizes in UK. Below is a US/UK comparison chart.
UK
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
10.5
11
11.5
12
US
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
10.5
11
11.5
12
12.5
13
G1-150
Sizes 4 – 10.5 UK
Flex 150
A stiff, close-fitting shell for experts and racers.
G.1-130
Sizes 4 – 10.5 UK
Flex 130
This is a slightly softer and roomier version of the full on race G1-150.
G.2-110 H
Sizes 4 – 11.5 UK
Flex 110
A softer high-cuff model designed for men. Suitable for lighter skiers and mogul skiers. The “H” refers to the high cuff design.