Sweater Day is observed on February 4 and encourages people to wear sweaters to conserve energy by reducing the use of heating. The holiday promotes layering warm clothing as a way to stay comfortable during cold weather while also raising awareness about climate change. It emphasizes the importance of individual actions in reducing carbon footprints and highlights the collective impact of small changes, such as choosing to wear sweaters instead of turning up the thermostat. Sweater Day was established by the World Wildlife Fund (W.W.F.) to advocate for energy conservation and to address the negative effects of human consumption on the environment and wildlife. Participants often enjoy the warmth and comfort of sweaters, sometimes borrowing them from partners, and reflect on their personal contributions to environmental sustainability.