Men's Superlamb DZO Work Boots Superlamb's Dzo Work Boots are named for the giant dzo of Mongolia which is a combonation of cattle and the giant yak and are used to pull and carry very heavy loads - this boot absolutely reflects it's namesake. Constructed with a genuine and durable leather upper and a just as hardy rubber traction outsole, every step you take can be taken with confidence and in total comfort.