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OTS Guardian Full Face Mask

Dive Pink & Fight Breast Cancer Includes a $5 Donation

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List: $849.00

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About OTS Guardian Full Face Mask

With over 60 years of diving experience and having sold almost every Full Face Mask (FFM) on the market, it was easy to see there was a need for something better. A common problem with most FFM is the seal. The lack of a good seal causes the diver to use air quicker and can interfere with the diver's ability to hear if using underwater communications. With that in mind, the GFFM was designed around a double seal. This along with many other great features (i.e. semi positive pressure, quick release 2nd stage, easy maintenance, etc.) is why you will find the Guardian is the best choice for your money when looking for a full face mask.

The Double Seal 55-60 Shore A Liquid Silicone Skirt with High Strength Polycarbonate Visor (Lens) was specifically designed to allow people with a small faces or a slim face, especially in the temple area, to seal better. Everyone has a little different face. As divers you all know how important being able to equalize is. Equalizing is a challenge for all full face masks One-Size does not fit all! In order to ensure everyone can equalize, OTS has put together an Equalizing Kit which comes with every Guardian full face mask. The kit consists of two bases. One is a standard size without any holes. It can be adjusted up or down to fit as necessary. The other base has two holes which allow for different size pads that can be added. In the event the standard base does not work for you, one of the pads and the other base should fit the bill.

The Guardian offers an easy to adjust buckle system. OTS has made the buckles out of a tough, robust compound which should give you years of use. However if a buckle does break, it will be easy to replace. There is definitely one thing you won't have to worry about and that is RUST. Rust is the number one cause of replacement when using metal buckles. The 5-Point Spider Strap is just the right thickness to allow for a comfortable fit no matter what depth you go to. As you go deeper, the strap will help take up the slack. When you go shallow and everything readjusts, so will the strap keeping you snug in your Guardian full face mask.

The ABV-1 Ambient Breathing Valve allows the user to breathe ambient air at the surface, conserving your tank air. It is simple to use and its low profile keeps it out of the way. To use the device, while on the surface simply rotate the valve counterclockwise. The one way valve will open and allow air into the FFM. The one way valve located on the inside of the FFM ensures that your exhaled air does not go back out the valve. Your exhaled air is sent out through the second stage regulator ensuring you do not get a Co2 "building" in the FFM. The valve also is forced closed when diving. The over pressure in the FFM assures that. If you forget to close the valve before diving, the valve disc will help keep water out.

The Guardian full face mask has a custom designed Balanced Downstream Demand Valve 2nd Stage Regulator that was specifically designed for a full face mask. OTS also realized what is involved with the maintenance of a full face mask and regulator. They designed the 2nd stage with trouble free maintenance in mind - it is easily removed! This is important for cleaning and/or maintaining your full face mask. The Regulator has an Injected-Molded High-Impact Housing for Strength and Durability and comes with a 32" (81.3 cm) 3/8" threaded Low Pressure Hose.

You paid hard earned money for your Full Face Mask. Why not keep it in a bag designed to store it like it is supposed to be stored. The mask bag was designed to help keep your mask in the right drying position, keeping water from pooling in your 2nd stage regulator. It also has vents to keep good ventilation helping to stop mildew and drain holes to let water drain away from the mask. Lots of storage pockets as well. One is a dry storage compartment! The bag has a carrying handle as well as a shoulder strap. In all, it's a great investment to help keep your valuable GFFM. The Guardian Full-Face Mask is available with a Black, Blue or Yellow Skirt with Black Frames or Black Skirt with Pink, Green, Blue or Red Frames, comes with a 12 month limited warranty and Owner's Manual.

DIVE PINK & FIGHT BREST CANCER! For every Pink Mask $5 will be donated to fight breast cancer.

The OTS Guardian Full Face Mask is commonly used for Open Water Diving, Recreation and more. The OTS Guardian Full Face Mask is most used by customers who consider themselves to be a Advanced among others. The OTS Guardian Full Face Mask is popular because customers like the following qualities of the OTS Guardian Full Face Mask: Does Not Fog, Lens Quality, Range of Vision, Snug Fit.

Warranty Information

This product has a limited warranty of 12 months.


OTS Guardian Full Face Mask Features

  • Guardian Full Face Mask:
  • Ocean Technology Systems (OTS): 60 Years of Diving Experience
  • Complete Mask with Regulator
  • Mask Bag: Wet & Dry Storage Pockets, Self Ventalating and Drainage with Carry Handle and Shoulder Strap
  • Owner's Manual
  • 1 Year Limited Warranty
  • Guardian Full Face Mask (GFFM):
  • Double Seal Designed Full Face Mask (FFM) Skirt
  • Skirt Material: 55-60 Shore A Liquid Silicone
  • Double Seal: Fits Small, Slim Faces, Especially in Temple-Area
  • Easy Adjust Buckle System
  • 5-Point Spider Head Strap
  • Low Volume Full-Face Design
  • High Strength Polycarbonate Visor (Lens)
  • Skirt Colors: Black, Blue or Yellow
  • Frame Colors with Black Skirt: Pink, Green, Blue or Red
  • Equalization Kit:
    Kit Consists of Two Bases, Standard Size and One with Holes
    4-Pads for Custom Fit
  • ABV-1 Valve: Breathe Ambient Air at Surface
    Conserving Tank Air
    Simple to Use
    Operation: to Breath, Rotate Valve Counterclockwise, Close Valve: Rotate Fully Clockwise
    Check Valve: Allows Air-to-Enter Valve Only
    Air is Exhaled-Out the Regulator
    Check Valve: Prevents Gas from Escaping via ABV if Open Underwater
  • Second-Stage Regulator:
  • Balanced Downstream Demand Valve
  • Custom Designed 2nd-Stage
  • Specifically Designed for Full Face Mask
  • Built with Trouble-Free Maintenance in Mind
  • Easily Removed from FFM
  • Easy to Clean Regulator
  • Injected-Molded High-Impact Glass Filled Nylon Housing for Strength and Durability
  • 32" (81.3 cm) 3/8" Threaded Low Pressure Hose

OTS Guardian Full Face Mask Customer Reviews Powered by TurnTo®

Review Summary


(based on 10 reviews)


of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Most Liked Positive Review


Great Mask

I've got 50 dives on the Guardian, and it's performed great. The double seal is great, and works well with people with narrow faces. My air consumption was initially a little higher using the FFM, but over time is back where it used to be. No worries about mask squeeze, dry mouth, or jaw fatigue anymore.


Most Liked Negative Review


Worst regulator I've ever breathed from

I'm a commercial diver, and I use this mask every day for work. There are a number of good features to the mask such as the double skirt, the strap design, the anti-fogging airflow path, and the ABV (ambient breathing valve). With that said, there is one unforgivable and overwhelming flaw: the regulator is, without any exaggeration, the worst regulator I have ever breathed from. This isn't just my opinion, but also an opinion unanimously shared by all my coworkers. The problem is that the wor...

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Reviewed by 10 customers

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Worst regulator I've ever breathed from


from Tofino, BC, CA

I'm a commercial diver, and I use this mask every day for work. There are a number of good features to the mask such as the double skirt, the strap design, the anti-fogging airflow path, and the ABV (ambient breathing valve). With that said, there is one unforgivable and overwhelming flaw: the regulator is, without any exaggeration, the worst regulator I have ever breathed from. This isn't just my opinion, but also an opinion unanimously shared by all my coworkers. The problem is that the work of breathing is exceptionally high, which quickly leads to hypercapnia (symptoms start with headaches, and eventually progress to nausea). It isn't an issue of adjustment or input pressure either, as I have very thoroughly experimented with a wide range of settings. The design of the regulator simply works against itself to prevent you from being able to get it to breathe easier, and several of the critical internal parts are made from crappy plastic. I'm not sure how a company can get away with this kind of thing in today's day and age. Avoid this product until they finally manage to get the kinks worked out with their new SRG-1 regulator that they've been trying to release for over a year now. By comparison, AGAs breathe like a dream, and they don't screech over comms like the guardians do. Too bad an AGA costs 2.5 times as much and isn't as nice in all the smaller mask details that I mentioned above.


A great mask


I purchased this when the National Aquarium where I volunteer started doing underwater talks and selected the GFFM as its mask for the underwater talks. I really like this mask, especially for cold water dives, but also enjoy it on warm water dives - no lens fogging; great fit (very comfortable; and I can breath through my nose. My SAC is a little higher but the trade-off is worth it.


I would buy this product avain


Use for recreational diving and it works great


Different but good


took it for the maiden dive today. i dont think i can go back to a normal regulator now. pros, doesnt fog, at all, good fit, no jaw fatigue. a con would be having to take a backup mask and clearing the water out of it takes a lot of air. however, the only time you should have to do that is when practicing mask/reg swaps.


guardian ffm isthe greatest


The OTS Guardian ffm is the greatest innovation in diving since the introduction of the BCD. All my dives are now undertaken using this fantastic mask. The vision is superb, the fit is excellent and the performance is great. What more could a diver want. As a UK diver, I wish OTS would promote this brilliant piece of kit more in England and Europe for the average sports diver and not let it drift into the province of "Techinical Divers" only. Com's aside, such a great piece of equipment should be common knowledge to the whole diving world. There's an old saying about knowing when something is "right" and this can be no truer than when it's revered to the OTS GUardian full face mask.

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Questions & Answers Powered by TurnTo®

Questions about this item:

Shopper  Why Did You Choose This?
sean b  clean boats for a living and not having to chomp down on a mouth piece for hours is a plus thanks
BRUCE W  Due to dental bridges my wife has a hard time biting the regulator mouth piece, sits out blood after a dive. This will solve this problem. Order second one for myself, wife loves hers.
TIM J  Great price on a quality full face mask!
TERESA P  We chose this mask because of all the reviews online and now having tried in open waters it does make justice to all the positive comments. It's very confortable and easy to use!
Shopper  Can you buy just the Guardian mask without the regulator then buy the new SRG1 regulator? If so how much?
KEVIN F  We do not sell the Guardian without the second stage.
ERIC C  I doubt it's possible from leisure pro. You may be able to call ots and have them work out a special package for you that way. Though as far as I know, the guardian mask and the stealth mask are identical in most respects, so it might just make more sense to buy the stealth.
Jim M  need info about light for mask?
Jaron B  Agree with the other poster - the simplest mount is the go pro-style light with a go pro sticker mount. Simple, Clean. SP Gadgets makes a good, cheap one that uses go pro batteries.
BARNEY C  What light?? There is no light
KEVIN F  You need to purchase and install the optional GFFM Accessory Rail Light System. The accessory rail system attaches to the Guardian full-face mask and makes it possible to mount various lights, cameras, and other devices to the sides of the mask.
ERIC C  If you're asking if I need information... no I do not. If you're asking for information... there are a few companies that hand make adapter rails for the mask. OTS has some partnership deal through their site that offers a rail with flashlight attachment. It was insanely overpriced at the time I looked though. 260$ I believe. They also have GoPro mounts with similar configuration. My suggestion is to find a company that makes a rail mount to the guardian and make your own light mount that attaches to it with band clamps. It'll save you a ton of money.
Jim M  Thanks for the info it was very helpfull.
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