Written by the Maui Snorkeling team, operating Molokini Crater, Turtle Town, and Coral Gardens tours out of Maalaea (Māʻalaea) Harbor since 1985. Tours are led by USCG‑licensed captains aboard a USCG‑inspected passenger vessel. We spend more days in these waters than on land.
Last updated July 29, 2026
Quick Answer
No. Full face snorkel masks are not allowed on Maui Snorkeling tours. We provide traditional mask and snorkel gear onboard at no extra cost. Full-face snorkel masks can be harder to clear if water enters, harder to equalize, and may increase breathing resistance or CO₂ rebreathing risk depending on the design and fit.
Main Takeaways:
Tour Policy: We don't allow full-face snorkel masks on our boats
Primary Concerns: Clearing water, equalizing limitations, and breathing resistance/CO₂ rebreathing risk (varies by model + fit)
What We Provide: Standard snorkel masks and snorkels, plus help with fit and basic clearing tips
Best Practice: Use familiar, easy-to-troubleshoot gear, especially in waves, current, or longer swims
Stop Immediately If: You feel “air hungry,” dizzy, confused, unusually tired, anxious, or short of breath. Signal for help, remove the equipment, and exit the water safely.
If You Already Own One: Check for recalls/safety warnings, test only in calm shallow water first, and never snorkel alone
Full-face snorkel masks combine the mask and snorkel into a single unit and allow the wearer to breathe through the nose or mouth. Some people find the design convenient, but airflow, fit, valve performance, and ease of removal can vary considerably across models and users. Because these masks can be harder to clear, remove, equalize, and troubleshoot quickly in open water, Maui Snorkeling doesn't allow them on our tours.
The four main concerns discussed below are:
Breathing resistance and possible CO₂ rebreathing
Harder emergency removal and communication
Equalizing and duck-diving limitations
Difficulty clearing water
Our Molokini Crater Snorkeling Tour and Maui Afternoon Tour include traditional masks and snorkels at no additional cost. Our crew can help guests with fit and basic clearing techniques before they enter the water.
In this blog, we will go into further detail discussing the four risks and shed light on why these masks are not suitable for snorkeling. To make the most of your snorkeling experience, our Molokini Crater Snorkeling Tour and Afternoon Tours provide reliable, traditional snorkeling masks suitable for all ages, eliminating the need to bring your own!
Note: If you need help choosing the right size/fit, our crew will help you onboard.
Full-face snorkel masks are designed to separate inhaled and exhaled air using internal channels and one-way valves. However, airflow can vary depending on the mask’s design, fit, valve condition, and whether water enters the system. If exhaled air is not cleared efficiently, the wearer may rebreathe some of that air, which can increase carbon dioxide levels and reduce the amount of fresh oxygen available.
Some full-face masks may also create greater breathing resistance than a traditional snorkel. This can make breathing feel more difficult, especially when a snorkeler is swimming against a current, kicking quickly, or becoming tired. The resulting feeling of “air hunger” may contribute to rapid or inefficient breathing, anxiety, disorientation, or panic.
A 2023 simulated-snorkeling study compared two full-face snorkel masks with a conventional snorkel. Researchers observed more frequent elevated carbon dioxide readings and lower oxygen readings while participants were using the full-face masks. Because the study tested only two models in a simulated setting, the results don't prove that every full-face mask performs the same way. However, they support concerns about airflow, breathing resistance, and possible CO₂ rebreathing in some designs.
Hawaiʻi Ocean Safety also identifies carbon dioxide buildup and decreased oxygen uptake as potential concerns, while noting that more research is needed to determine whether full-face masks directly increase the risk of drowning. Snorkelers should never ignore symptoms such as dizziness, headache, confusion, unusual shortness of breath, or increasing discomfort. Anyone experiencing these symptoms should remain calm, remove the equipment, and exit the water safely.
Because fit, airflow, and valve performance can be difficult to evaluate quickly in open water, Maui Snorkeling doesn't allow full-face snorkel masks on our tours. We provide traditional masks and snorkels that are easier for our crew to fit, inspect, clear, remove, and troubleshoot when assistance is needed.
Harder Emergency Removal And Communication
Full-face snorkel masks cover the eyes, nose, and mouth and generally use a more complex strap system than a traditional mask. If water enters the mask, breathing becomes uncomfortable, or the wearer begins to panic, the entire mask may need to be removed before the problem can be addressed. Hawaiʻi Ocean Safety identifies difficulty removing the mask as a potential concern and notes that the straps' complexity may contribute to panic.
Traditional snorkeling gear provides a simpler response. A snorkeler can release the mouthpiece immediately while keeping the mask over the eyes and nose. Once the snorkeler lifts their face out of the water, they can breathe normally, speak to a buddy or crew member, and listen to instructions without first removing the mask.
Communication may be less direct with a full-face mask because it covers the wearer’s mouth. Speech can be muffled, and the mask may need to be lifted or completely removed before the snorkeler can communicate clearly. This can be especially important when someone is tired, anxious, disoriented, or in need of immediate assistance in open water.
Maui Snorkeling uses traditional masks and snorkels because our crew can quickly help guests remove, refit, clear, adjust, or replace the individual pieces. For the same reason, full-face snorkel masks brought by guests are not allowed on our tours.
Equalizing And Duck-Diving Limitations
Most full-face snorkel masks are designed primarily for use at the surface. When a snorkeler intentionally dives below the surface, water pressure increases with depth, and the ears may need to be equalized.
With a traditional snorkel mask, the nose pocket is normally accessible, allowing an experienced snorkeler to pinch the nose and equalize gently. Many full-face designs make the nose difficult or impossible to pinch without a separate equalization feature.
Snorkelers should never continue descending if they experience ear pressure or pain. Return to the surface and don’t duck-dive unless you’re comfortable, experienced, and using equipment designed for it.
Difficulty Clearing Water
Full-face snorkel masks use integrated seals, breathing channels, valves, and drainage systems, so the response to a leak can vary by model. A small amount of water may drain through a valve, but significant leakage, a blocked valve, or water entering the breathing area may require the wearer to lift or remove the entire mask.
Removing a full-face covering can be harder to manage when someone is surprised, tired, anxious, or trying to stay afloat in open water. Water intrusion may also impair visibility or make breathing uncomfortable before the wearer addresses the source of the leak.
A traditional mask and snorkel can be handled separately. Water in a traditional mask can usually be cleared by maintaining the seal at the top of the mask and exhaling through the nose, allowing the water to escape along the lower edge. Water in the snorkel can be cleared separately, and the snorkeler can release the mouthpiece and breathe normally at the surface while keeping the mask in place.
Traditional masks can still leak if the fit is wrong, but most seal problems are easy to correct. See how to stop a snorkel mask from leaking before entering the water.
Full-Face Snorkel Mask Vs. Traditional Mask And Snorkel
Here’s a side-by-side look at how traditional snorkeling gear and full-face masks differ in breathing design, water clearing, equalizing, communication, emergency removal, and Maui Snorkeling’s equipment policy.
Feature
Traditional Mask And Snorkel
Full-Face Snorkel Mask
Basic design
Uses a separate mask that covers the eyes and nose and a snorkel with a mouthpiece.
Uses one integrated piece that covers the eyes, nose, and mouth, with the snorkel attached to the mask.
How you breathe
The snorkeler breathes through a mouthpiece while keeping the mask sealed over the eyes and nose.
The snorkeler can usually breathe through the nose or mouth while internal channels and valves direct airflow.
Airflow and CO₂
Uses a relatively simple breathing pathway that does not depend on internal mask valves to separate inhaled and exhaled air.
Airflow depends on the mask’s channels, valves, fit, and condition. Some designs may create greater breathing resistance or allow more exhaled air to be rebreathed.
Clearing water
The mask and snorkel can be cleared separately. If water enters only the snorkel, the mask can usually remain in place.
Drainage systems vary by model. Significant leakage, a blocked valve, or water inside the breathing area may require the entire mask to be removed.
Equalizing
The nose pocket is normally accessible, allowing an experienced snorkeler to pinch the nose and equalize while diving below the surface.
Many models make the nose difficult or impossible to pinch unless the mask includes a separate equalization feature.
Diving below the surface
Can be used for surface snorkeling or duck diving when the snorkeler has the necessary skills and conditions are appropriate.
Most models are intended for surface use rather than diving below the water. Increased pressure may affect comfort, fit, and the mask’s seal.
Speaking and communication
The mouthpiece can be released while the mask remains in place, making it easier to speak, listen, and respond to crew instructions.
Speech may be muffled, and the mask may need to be lifted or removed before the snorkeler can communicate clearly.
Emergency removal
The snorkeler can immediately release the mouthpiece and remove the mask using its strap if necessary.
The entire face covering may need to be removed using multiple straps or buckles, which can be more difficult when someone is tired, anxious, or disoriented.
Fit and adjustments
The mask and snorkel can be fitted, adjusted, inspected, or replaced separately. Crew members can also troubleshoot individual components.
The seal, valves, breathing channels, and snorkel are part of one integrated system. Fit and performance can vary considerably by model and face shape.
Maui Snorkeling policy
Allowed and provided at no additional cost. Our crew can help guests select and adjust the appropriate size.
Not allowed on Maui Snorkeling tours, including masks brought by guests.
Note: Full-face snorkel mask designs and performance vary by manufacturer, model, fit, and condition. This comparison explains general design differences and Maui Snorkeling’s tour policy. It does not mean every full-face mask performs identically.
What If I Already Bought A Full-Face Snorkel Mask?
We recommend using the standard mask-and-snorkel gear provided on our tours. Review the snorkel gear included on Maui Snorkeling tours before deciding what to bring. If you own a full-face mask and are considering using it somewhere else, follow these minimum precautions:
If it is an OUSPT mask, stop using it immediately and follow the CPSC’s disposal guidance. Don’t sell it or give it away.
For any other model, check current product warnings, recalls, manufacturer instructions, size requirements, and age restrictions.
Practice breathing through the mask and removing it on land before entering the water.
Don’t use the mask if breathing feels uncomfortable or you have difficulty removing it outside the water.
Never snorkel alone.
Avoid waves, surges, currents, rough conditions, and long swims.
Stop immediately if you feel short of breath, dizzy, confused, anxious, unusually tired, or “air hungry.” Remove the equipment and exit the water safely.
Tradtional snorkel mask on a Maui Snorkeling Tour
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No. We don't allow full‑face snorkel masks on our tours. We provide traditional snorkel gear onboard.
They can be harder to clear if water enters, harder to equalize, and may increase breathing resistance and the risk of CO₂ rebreathing, depending on the model and fit. Traditional gear is easier to troubleshoot quickly.
Not necessarily. Beginners benefit from simple equipment that’s easy to clear, adjust, and swap quickly, which is why we use standard mask-and-snorkel gear.
Not on Maui Snorkeling tours. Full-face snorkel masks aren’t allowed for adults or children. Proper fit, comfortable breathing, and quick equipment removal are especially important for younger snorkelers, so we provide traditional gear and crew assistance with fitting.
We provide traditional snorkel masks and snorkels on board (and our crew helps with fit and offers basic clearing tips).
Shortness of breath, dizziness, confusion, anxiety/panic, unusual fatigue, or feeling “air hungry.” Signal for help and rest/float right away.
Current Hawaiʻi Ocean Safety guidance doesn't describe a statewide ban. Instead, it warns of potential risks, provides safety precautions, and states that OUSPT full-face snorkel masks should not be used under the March 2026 CPSC warning. Individual tour operators may establish stricter equipment policies. Maui Snorkeling doesn't allow full-face snorkel masks on its tours.
Final Thoughts: Maui Snorkeling Provides Traditional Snorkel Gear
For Maui Snorkeling tours, full-face snorkel masks aren’t allowed. Depending on their design and fit, these masks can be harder to clear, remove, equalize, and troubleshoot and may raise concerns involving breathing resistance or CO₂ rebreathing.
We provide traditional masks and snorkels at no additional cost. Our crew can help fit the equipment, explain basic clearing techniques, and assist guests before they enter the water. Happy snorkeling!
Sources & Updates
Use these trusted resources to review current Hawaiʻi snorkeling guidance, the March 2026 OUSPT product warning, and peer-reviewed research on airflow, CO₂ rebreathing, oxygen levels, and full-face snorkel mask performance.
