Green Johanna Winter Jacket – Keep Your Compost Working All Year RoundThe Green Johanna is designed to compost properly but like any system, it relies on heat. When temperatures drop, composting slows down and can stop altogether. The Winter Jacket simply wraps around your Johanna to retain that heat, keeping microbial activity going so your compost continues working through the colder months. Its a simple addition but it makes a big difference. Key Benefits Keeps Compost Hot in Cold Weather: Insulates your Green