These awesome koozies have magnets sewn into them so you can attach your beverage to any metal surface. Soft PVC encased neodymium magnets make it so you don't have to worry about scratching your truck if you leave your beverage attached to the side of it. Just like our standard koozies we use neoprene -not foam- so they keep your drink colder for longer and don't wear out. 100% of the proceeds from these coozies go to keeping your public lands like Johnson valley, rubicon trail, ocotillo wells, eastern sierras, carnegie etc. open for all.