Everlane Women's The Puffa Boot in Black Leather Size 7.5. The Puffa Boot leather Chelsea style features elastic at the sides for pull-on ease and comfort that feels so good, you won’t want to take it off. Talk about fashion and function. This boot uses leather sourced from a tannery rated Gold by the Leather Working Group (LWG)—the highest rating a tannery can receive for demonstrating best practices in environmental compliance and performance capabilities. Sustainable.