I'm a ninja... you can't see me

As I have started work on my sword wielding monkey project, I thought I'd go mental on ninjas and stuff for a bit, you know, get in the zone.
So here is a snow ninja, unlike common ninja, the snow ninja is clad predominantly in white, unlike its black or dark blue clad counterpart.
The snow ninja is often found at high altitudes or in tundra reagons, they are recognised by their pentient for hunting monkeys with swords!