Ocean Reef Neptune III Full-Face Diving Mask ID250 (Limited Edition)
In stock — ships from Irvine, CA
Ocean Reef Neptune III Full-Face Diving Mask ID250 (Limited Edition) - S/M is backordered and will ship as soon as it is back in stock.
Pickup available at 23D
Usually ready in 2-4 days
Ocean Reef Neptune III Full-Face Diving Mask ID250 (Limited Edition) - S/M is backordered and will ship as soon as it is back in stock.
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Product Information
The Neptune III ID250 is a limited-edition full-face diving mask with an integrated regulator designed for natural breathing and extended underwater communication. The design combines a transparent polycarbonate visor, silicone oral-nasal pocket and a vertical body-balanced second-stage regulator to reduce fogging, reduce jaw fatigue and support headset integration for dive comms.
- Full-face diving mask with integrated vertical body-balanced second stage regulator (Neptune III)
- Transparent polycarbonate visor with siloxane resin coating for scratch and chemical resistance
- Silicone oral-nasal pocket with dual one-way valves for nasal and oral breathing
- Patented bellows double “S” face seal and 3D equalization system for comfort and fit
- Cold-water CE certification for full-face use and STANAG 4296 impact-tested visor
- Surface air valve, purge button and Venturi dive/pre-dive lever for flow control
- Six-strap head harness with fast-rotating buckles and one-hand doffing handle
- Includes Neptune III backpack, extender kit, standard hose, multitool and doffing handle
| Materials | Silicone skirt and oral-nasal pocket; polycarbonate visor with siloxane resin coating; high-strength polymer regulator housing |
| Visor Material | Transparent polycarbonate, both sides coated in siloxane resin (impact resistance tested to STANAG 4296) |
| Oral-Nasal Pocket | Medical-grade silicone with two one-way valves |
| Regulator Type | Integrated vertical, body-balanced second-stage regulator; cold-water CE certified for full-face use |
| Certifications | Cold-water CE certification for full-face use; visor impact resistance tested (STANAG 4296); field-of-vision certification (italcert PPE-05 Rif 1332/05) |
| Face Seal | Patented bellows double “S” skirt with floating effect for improved comfort and seal |
| Field Of Vision | Wider field of view than competitors (certified) for improved situational awareness underwater |
| Head Harness | Six-strap harness with fast-rotating buckle system for secure fit and rapid doffing/donning |
| Inclusions | Neptune III diving mask w/ integrated regulator, Neptune III backpack, doffing handle, surface air valve, standard hose, extender kit, multitool |
| Warranty | Mask: lifetime warranty; other components: 2 years |
- Neptune III Diving Mask with integrated second stage regulator
- Neptune III Backpack
- Doffing Handle
- Surface Air Valve
- Standard Hose
- Extender Kit
- Multitool
⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
Frequently Asked Questions
Why dive with a full-face mask like the Ocean Reef Neptune III?
A full-face mask integrates the second stage regulator into the mask, so there is no mouthpiece to bite and no regulator to lose — you breathe naturally through your nose and mouth, which many divers find far more comfortable and less fatiguing, especially on long or cold dives. The six-strap harness holds it securely, the field of view is wide, and because your mouth is free, the mask is ready for underwater communication systems. It is popular for cold water, public safety, and any diver who wants a more relaxed breathing experience.
What size Ocean Reef Neptune III do I need?
The Neptune III comes in two sizes, measured by the distance from the bridge of your nose to the bottom of your chin: Small/Medium fits roughly 10–11.5 cm (smaller faces, many women, and children 12 and up), and Medium/Large fits above 11.5 cm. The right fit leaves no gap between your chin and the silicone skirt. If you are unsure, measure nose-bridge to chin and send us the number and we will confirm the size.
Is the Ocean Reef Neptune III certified and safe for cold water?
Yes — the Neptune III is CE marked as Category III PPE, compliant with the EN 250:2014 diving standard, cold-water rated for use below 10°C, and tested to 61 meters. A patented internal air-circulation system keeps the lens from fogging and continually flushes exhaled air to minimize CO2 buildup, and a built-in 3D equalization device lets you close your nostrils to equalize without breaking the mask seal. It is a properly certified full-face system, not a surface snorkel mask.
How do I know if a dive mask fits?
Hold the mask against your face without using the strap, look slightly down, and inhale gently through your nose; a well-fitting mask holds itself in place for a few seconds. Check that the skirt seals all the way around without digging into the nose bridge, and that there are no gaps at the temples or above the upper lip. A mustache can break the seal even on an otherwise well-fitting mask.
Why does my brand new mask fog no matter what I do?
New masks carry a residue on the inside of the lens left over from manufacturing, and defog cannot stick to it, so the mask fogs until that film is removed. The standard pre-treatment is to scrub the inside of the lens with a mild abrasive cleaner or a dedicated mask prep and rinse thoroughly, repeating if it still fogs. Follow the mask manufacturer's instructions, particularly on coated or mirrored lenses.
How do I stop my dive mask from fogging?
Apply defog to a dry lens before the dive, spread it over the whole inner surface, then rinse briefly with water just before you put the mask on. Fogging happens when warm moist air meets a cooler lens, so a clean lens with a thin surfactant film is the fix. Keep sunscreen off your fingers before handling the inside of the lens, because that film fogs badly and is hard to remove.
Why do dive masks need tempered glass?
Dive mask lenses should be tempered safety glass because it resists scratching and, if it ever does break, fractures into blunt granules rather than sharp shards next to your eyes. Untempered or plastic lenses scratch easily and can craze, which is why tempered glass is standard on scuba masks. Look for the tempered marking etched on the lens.
Can I get a dive mask with my prescription?
Yes, prescription options are widely available, usually as masks fitted with stock corrective lenses in set diopter steps, custom-ground lenses installed in compatible frames, or bonded lenses added to an existing lens. Not every mask frame accepts replacement lenses, so check compatibility before you buy the frame. An optician or a dive shop can help translate your glasses prescription into a mask lens choice.
How should I care for and store a dive mask?
Rinse it in fresh water after each dive day and let it dry away from direct sunlight, avoiding anything abrasive on the treated inner lens. Store it in a rigid mask box so the skirt is never compressed or creased, since a set crease in the skirt is a permanent leak. Keep silicone skirts away from petroleum products and prolonged UV, both of which yellow and harden them.
How tight should a dive mask strap be?
Not tight at all in the usual sense, because over-tightening is the most common cause of both leaks and headaches; a hard-pulled strap distorts the skirt and lifts the seal off your face. The strap should sit high on the back of your head and be just firm enough to keep the mask from shifting. If you need it cranked down to stop a leak, the mask does not fit your face.
