Kangaroo leather is lighter, stronger, and more flexible than goat or cow hide. It’s usually thinner too, given you can make tough-as-nails kangaroo boots with skin that’s barely a millimeter thick. (Cowhide boots are usually 1.4 to 2 millimeters.) Unsurprisingly, this means that they make a much lighter final product: kangaroo leather boots usually weigh half as much as comparable cow-leather ones.

All that’s because the skin of the animals themselves are very different. The collagen fibers that make up kangaroo hide are fine, concentrated, highly uniform, and parallel to the surface of the skin, unlike cow skin’s irregular, bundled structure. Kangaroo hide also has very low fat content and a thin grain layer, without sweat glands and erector pili muscles, which means it doesn’t require the splitting and shaving that some other leathers require (hence the resulting thin, supple, strong leather). Plus, elastin is evenly distributed throughout the skin, which means it’s uniformly stretchy. All of these factors give kangaroo leather a ton of tensile strength: it can stand being pulled apart.