Ocean Reef Neptune III Package - Black S/M Mask + DIN 1st Stage

Ocean Reef IDM | SKU: OR025320

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$1,899.95

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Color: Black

Ocean Reef Neptune III Package - Black S/M Mask + DIN 1st Stage-Black

Ocean Reef Neptune III Package - Black S/M Mask + DIN 1st Stage-White

Ocean Reef Neptune III Package - Black S/M Mask + DIN 1st Stage-Blue-S/M-

Size

S/M (Small / Medium) ML (Medium Large)

Ocean Reef integrated dive mask sizing. Imperial in bold, metric underneath.

Size	Nose bridge to chin in · cm
S/M	3.9–4.5 10–11.5
M/L	>4.5 >11.5

How Ocean Reef measures

It is essential to choose a suitable size. You can choose between size S/M (for adults with smaller faces, women and children over 12 years old) and size M/L (for an adult male, or larger faces).

Nose bridge to chin: Measure the distance between the bridge at the top of your nose and the bottom of your chin.
Try-on: There are two different size categories on the chart: Small/Medium and Medium/Large. If the measurements fall within the both ranges, then the diver should technically be able to wear either full face mask (M/L or S/M), and in that case should try on a mask to select the best fit. Once the mask is tight on your face, if there is NO SPACE between your chin and the silicone skirt of the mask, you've got the right size.

Source: Ocean Reef’s size chart (original chart). Values in the second unit come from Ocean Reef’s own chart where it prints them.

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Product Information

The Full Face Mask IDM is the ultimate choice for SCUBA Diving enthusiasts. With its effortless design, innovative features, and rugged construction, this mask is built to withstand any diving adventure. Not only is it comfortable to wear, but it also offers a panoramic view underwater. Safety is a top priority, making this mask practical and functional. It comes complete with everything a diver needs, including two sizes and two color options, as well as the choice between INT (Yoke) or DIN first stage. The quick disconnect octopus and hose for both the IDM and octo ensure easy setup and breakdown. Additionally, the back-up mask pouch, pressure gauge, and feature-rich Neptune III backpack are all included. Dive into the future with the Full Face Mask IDM.

⚠️ 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.