Sizing is easy, order your regular shoe size, but go up one size if you have big wide feet.
Or, you can follow this sizing method...
Measure your feet length against the boot's inside length (see below).
The inside length should be at least 15-20mm longer than your feet.
This measurement gives you the correct toe clearance for safety and comfort.
-39eu = 6 usa / 5 uk mens = 8 womens = 260mm inside length-40eu = 7 usa / 6 uk mens = 9 womens = 265mm inside length-41eu = 8 usa / 7 ukmens = 10 womens = 270mm inside length-42eu = 9 usa / 8 uk mens = 11 womens = 280mm inside length-43eu = 10 usa / 9 uk mens = 12 womens = 285mm inside length-44eu = 11 usa /10 uk mens = 290mm inside length-45eu = 12 usa /11 uk mens = 300mm inside length-46eu = 13 usa /12 uk mens = 305mm inside length-47eu = 14 usa /13 uk mens = 310mm inside length