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Equalization with Doc's Proplugs: Doc's Proplugs have also been used by divers who have trouble equalizing. Unlike other earplugs which are solid and would not be recommended for diving, Proplugs are vented to allow equalization. While the small vent allows equalization to occur it does not allow debris to enter and it prevents earwax from washing out which exposes delicate ear tissue. The Proplugs keep ears warm by storing the head's conductive heat; the warmth provided by the plugs drastically reduces the risk of thermal shock. Due to surface tension the vented plug also reduces abrupt pressure changes from reaching the sensitive eardrum which contributes to easier equalization. Clear ears often to allow air to escape through the Proplugs vent and allow for better equalization. Proplugs wearers who have trouble clearing their ears should check to make sure a lump of ear wax is not blocking the canal or butting up against the vent. If the vent is fouled by debris while descending it is best to remove the Proplugs. If fouled while ascending, there is no problem because the air and water under pressure can escape around the Proplugs. Hundreds of divers have attested to the benefits of Proplugs for relieving pressure in their ear during descent. Proplugs can also be used around loud machinery and noises with their 20dB noise rating. Plugs come in a convenient plastic carry/storage case and are available in clear or red. Designed to protect the ear from cold water, impact, loud noise, and high frequency noise, while still allowing you to hear normal sounds.