With regular foot flippers, people with different foot sizes each need a different foot flippers size to fit them.
They also adjust to fit different leg sizes and shapes. The one size easily fits everyone taller than about 140 cm (4 feet 7 inches). They still fit if you are a bit shorter. They just stick out a bit further from your toes.
Fins easy to share with family and friends can save you a lot of money too.
See all faqs about the adjustable fit of these fins.