Open-heel adjustable fins are worn with scuba booties. The foot pocket allows for the foot and bootie. The fins are tightened with a heel strap, which allows a few different sizes of foot and bootie for each fin. Open-heel adjustable fins are chosen by the majority of divers because they are designed to account for the drag that all the scuba equipment creates. The feet will be much warmer with the booties on, and the booties provide protection when walking around without the fins.