What type of fit is necessary for effective dry suit diving?

A snug and comfortable fit is necessary for effective dry suit diving because it ensures that the suit effectively traps a layer of air against your body, which helps to insulate you and keep you warm in cold water. If the suit is too loose, it can allow water to enter and circulate inside the suit, reducing thermal protection and making it difficult to maintain buoyancy control. Conversely, while a very tight fit might seem advantageous for preventing water from entering, it can restrict movement and reduce comfort, which can lead to fatigue and impair your ability to dive safely. Achieving the right balance with a snug fit allows for proper mobility while ensuring that the suit functions effectively as intended in cold-water conditions.