These sleeve, be they Blue or Black, are some of the best I and my guys have ever used. Its really that simple and not many welders I know like those lighter weight gross colored green sleeves. If you buy any of these or those slime green sleeves remember they are NOT a leather replacement.
ProsThey're not that lousy green, they are a just as if not more durable.
ConsThey don't come with Beer and they can't help you weld upside down and backwards with a mirror because if dumbassed engineer doen't know squat about haw anything is fabricated...and they aren't leather.