Booties keep your feet warm while diving in cold water. They also provide traction on slippery surfaces and protect your feet from sharp objects and hot surfaces. Additionally, they are usually required when wearing heel strap fins because they prevent blisters and allow the foot to fit the fin's pocket properly. For these reasons, booties are recommended regardless of water temperature.

Booties are available in many sizes and styles, but most share some common features. Most are constructed of neoprene, which provides thermal protection. A rubber sole provides traction on slippery surfaces. A side zipper is a popular feature that allows ease of entry and a snug fit. Many booties have rubber heels and toes to protect them from premature wear from a fin pocket or strap.