International men of mystery might be interested in these very cool boot laces developed by Shomer Tec, which are designed to get you out of worst-case-scenario situations normally revered for spy movies and espionage novels.
Woven from Technora and available here, they're strong enough to cut through not just duct tape and zip ties but even paracord. They can also hold up to 950 pounds when needed and they're finished with an integral handcuff key that secures over an aglet but can be easily removed in a pinch.
Sure, it's far from essential. But life is too short to not have a little Q-Branch technology in it, right...?