As the water in Silfra is very cold, you must wear waterproof dry suits that keep you dry and your body warm. These suits are made from a special, thick material that is designed to effectively resist the freezing cold temperatures. You will need to wear a rubber strap around your neck to ensure that the water does not get inside the suit. The tour company will provide you with these suits.
To increase your thermal insulation and comfort we recommend that you bring your own long sleeved thermal undergarment. Please bring it to wear under your dry suit. The suit is filled with air which, therefore, keeps it completely dry and also allows you to float on the surface of the water.
The dry suit might feel heavy as you put it on but as soon as you hit the water that feeling will disappear. You will also be given diving goggles, a breathing pipe, a hood, a pair of gloves, and flippers.