While many Arctic wolves do have white fur, it's not universal. They can also have shades of gray, brown, or even black, depending on their individual genetics and the specific location they inhabit.
The white fur is a great camouflage in snowy environments, helping them blend in while hunting and avoiding predators. However, variations in fur color are common, and some wolves may have darker fur for better camouflage in areas with more rocks or vegetation.