Suction Control.Air pressure release valve tightens the silicone sleeve, creating a controllable, natural suction sensation without batteries. By placing a finger over the air pressure release valve during use, you can control the suction intensity exactly to your liking for a customizable, totally natural feeling.CleanTech Silicone.Keeping Pow fresh is simple. Arcwave’s cutting-edge CleanTech Silicone is super smooth, hygienic and durable but is also very flexible to accommodate all penis sizes. Precision engineering gives this material a superior finish, as well as making it durable for continued use.Quick Clean Helix.Smart structure within Pow’s inner sleeve optimizes cleaning and drying speed without compromising on those smooth sensations.Quick-dry Ventilation Lids.Pow has specially shaped lids designed to protect the toy when not in use as well as enable better ventilation for fast and hygienic drying.