Major factors when shopping for sustainable denim is water usage and cotton treatment. Brands such as Levi's have programs like Water<less, which is a denim production technique that produces far less water than the traditional methods. Levis is also part of the Better Cotton Initiative which makes the cotton production better for the people producing it and the environment.

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P.S. - If you are building your sustainable collection or just buying new outfits for fun, please consider going through the links in this blog post. It helps keep the website going, community supported, and the information free! Plus, it doesn't cost any extra. Win-win!