Designed and handmade in Canada in collaboration with Fynbos Cape Town , a small sewing studio, using ethically sourced South African Shweshwe fabric, these jar cozies fit our 16oz sourdough starter jars to keep your starter warm and stable. Shweshwe is a traditional South African cloth, 100% cotton, made using a unique wax printing technique. The linen exterior is 100% organically grown and woven in Denman Island, BC.