This is the DUI Zip Seal Heavy Duty With Dams Scuba Diving Gloves - Blue Features: This unique system is intended for dives where the risk of a glove leaking as a result of damage is high or the diver prefers to have a redundant seal on their wrist. To provide this redundant seal, ZipGloves-WD are equipped with a WristDam; a donut-shaped wrist seal. This unique system is intended for dives where the risk of a glove leaking as a result of damage is high or the diver prefers to have a redundant seal on their wrist. To provide this redundant seal, ZipGloves-WD are equipped with a WristDam(TM); a donut-shaped wrist seal.