Most jeans fall apart within 18 months. A study by the University of Leeds found that cheap denim loses 30% of its tensile strength after just 10 washes. The average person buys three new pairs per year, spending roughly $240 annually on denim that looks faded and tired by spring. This cycle is expensive and wasteful. You can break it by choosing one pair of well-made jeans that will outlast a dozen fast-fashion replacements. Here is exactly how. What Makes Denim Last? The Three Pillars of Longevity Denim durability comes down to three things: fiber quality, construction method, and fabric…