Check the listing for details. IST ProEar Pressure Equalization Mask with Watertight Ear Cups. Condition: New. Listed at 132.60 USD. IST ProEar Pressure Equalization Mask with Watertight Ear Cups PRODUCT DESCRIPTION Special tube and seal system automatically equalizes ear pressure as diver exhales into mask; Prevents pressure-induced ear ache (barotrauma); Enhanced underwater hearing and sense of direction; Watertight ear cups keep water out to keep ears warm and prevent infection; Optical prescription lens option available in diopters from -1.0 to -8.0 in -0.5 decrement. We ship Monday-Friday 8:30AM - 5PM of EST While some orders would not be shipped out same or next day, they will be delivered by the eBay estimated delivery date. If you desire the item sooner, please, choose expedited shipping options. Please, contact us through eBay messaging if you need more information on the product