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https://www.blundstone.com.au/work-boots/extreme-series

Extreme Series

The toughest of the tough. From intense environments like mines and smelters, these will stand up to the abuse. Resistant to 300 degrees Celsius, these are serious boots.

Women's size guide
Men's size guide
Youth size guide
Kids size guide
Lifestyle sizes
AU Size US Men US Women
2 3 5
2.5 3 wide 5 wide
3 4 6
3.5 4 wide 6 wide
4 5 7
4.5 5 wide 7 wide
5 6 8
5.5 6 wide 8 wide
6 7 9
6.5 7 wide 9 wide
7 8 10
7.5 8 wide 10 wide
8 9 11
8.5 9 wide 11.5
9 10 12
9.5 10 wide 12 wide
10 11 13
10.5 11 wide  
11 12  
12 13  
13 14  
14 15  
Safety sizes
AU Size US Men US Women
2 3 5
2.5 3 wide 5 wide
3 4 6
3.5 4 wide 6 wide
4 5 7
4.5 5 wide 7 wide
5 6 8
5.5 6 wide 8 wide
6 7 9
6.5 7 wide 9 wide
7 8 10
7.5 8 wide 10 wide
8 9 11
8.5 9 wide 11.5
9 10 12
9.5 10 wide 12 wide
10 11 13
10.5 11 wide  
11 12  
12 13  
13 14  
14 15