National Flip Flop Day is celebrated every third Friday of June in the United States, inviting people to embrace summer relaxation by wearing flip flops. This day encourages individuals to kick off their shoes and enjoy casual outings, beach days, or lounging at home in their favorite pairs. Participants are encouraged to share their flip-flop fashion and explore new styles while enjoying the laid-back vibe of the season. The holiday was established by the American restaurant chain Tropical Smoothie Cafe, which offers a free Jetty Punch Smoothie to customers wearing flip flops at participating locations. Proceeds from these sales support Camp Sunshine, a program that provides respite and support to children with life-threatening illnesses and their families.