Snorkels for freediving and spearfishing are different: made of flexible materials to bend in the water, still rigid enough to spring back into shape on the surface. Freedive snorkels have a smaller, softer mouthpiece for comfort that lasts longer than other types of snorkels. Snorkel diameter tends to be a bit larger than other snorkel types, but still easy to clear. Dry tops and purge valves are unusual on freediving or spearfishing snorkels because they add extra drag and weight.