For years, I packed a pair of Havaianas flip-flops on every trip, from an active getaway in Croatia to a beach holiday in Puerto Rico. But whenever I wore them, I was powering through chaffing between the toes and calf pain from the thin, foam-like soles.
Then one day, I found a pair of old Speedo slides with arch support and a heel cup in my closet. I slid into them and couldn’t believe the difference after a day – both issues were eliminated, plus they were just so comfy because of…

