Sunday February 16 2020
September 30, 2014

OTS Guardian Full Face Mask Review

I have always loved the idea of breathing both from my mouth and nose underwater.

No dry throat after a dive, no jaw fatigue and no cold face! Beyond these, you can even communicate with your buddy if you use the proper equipment within your full face mask.

Sounds cool, doesn’t it?

Using a full face mask during your dives is very comfortable.

However, most full face mask owners (including me) complain about the seal.

If your full face mask doesn’t seal well, you consume more air, cannot effectively communicate with your buddy/boat and of course it is very uncomfortable to clear your mask frequently.

But there is a full face mask which seals 100% regardless of the shape of your face. There are also other key features to help a diver make safe and comfortable dives!

How I Met With OTS Guardian Full Face Mask

Last week, I was in Sharm El Sheikh, Egypt.

I met Jim, a British dive lover who is diving with a full face mask.

We were in the same boat, even in the same dive group.

During Jim’s preparations for our dive, I realized that it was an OTS Guardian Full Face Mask.

I have seen it on the Internet couple of times and red the comments about this unique full face mask.

Then I decided to see Jim underwater with his OTS Guardian Full Face Mask and watch for his comfort.

He was very pleasant during his dive.

I didn’t see him clearing his mask once!

That seemed to be awesome.

Couple of minutes later in Ras Mohammed National Park, I saw an Eagle Ray swimming towards us!

I was freaking out to be able to point this beautiful ray to my buddy because she was looking somewhere else. I tried to reach her and poke, used my shaker and etc. By the way, the eagle ray ran away!

But for Jim and his buddy, this was simple. Because they were able to communicate.

They watched and admired this wonderful creature while my buddy was looking somewhere else and I was trying to get her attention.

When we were back on he boat, I asked Jim about his OTS Guardian Full Face Mask.

He said it is very comfortable and sealing is never a problem.

Guess what?

He asked me if I want to use his OTS Guardian Full Face Mask in our next dive!

I was able to test OTS Guardian Full Face Mask for me and of course for you guys.

Key Features of OTS Guardian Full Face MaskOTS Guardian Full Face Mask5

I want to talk about the useful features of OTS Guardian Full Face Mask including my personal experience with this product.

If you have any questions about these features, please don’t hesitate to ask them in the comments section right below the article.

Double Sealing

OTS Guardian Full Face Mask’s best feature!

It has two seals.

There is an extra seal right above the original skirt seal.

This makes OTS Guardian Full Face Mask fit on all type of faces.

Whether you have a slim face or bushy beard, you don’t have to think about leaking. I have tried it in every positions underwater and even in up-side-down, no leaking!

Buy OTS Guardian Full Face Mask From 

Unique Equalization System

As you know, ear equalization is a question mark for divers who have never used a full face mask before.

Simply, there is a “clip” in your mask where your nose is. This “clip” squeeze your nose to help you inhale slowly and equalize.

This clip simulates your thumb and index finger just like you are performing a valsalva maneuver.

However, in most full face masks, your nose wasn’t exactly fitting this clip. Because every person has a unique length between their chins and noses.

OTS Guardian Full Face Mask offers us a fine tunable equalization system.

There are two bases in the equalization kit. One has no holes on it and you can easily set it to “high” or “low” position. This standard base is powered by suspension.

The other base has two holes. If you need to use additional pads, you can attach them to this base. Just try one of the pads and the second base if the standard base doesn’t fit.

By this way, everyone can easily equalize.

OTS Guardian Full Face Mask4Wider View

OTS Guardian Full Face Mask is a low volume mask.

Air trapped inside your mask doesn’t pull it to the surface.

It is hydrodynamic, it doesn’t vibrate in the middle of a current/when you move forward.

Last but not least, due to the low volume, the lens of the mask is closer to your eyes, resulting a better, wider view.

Right Sided Hose

The regulator hose comes over your right shoulder.

First I thought it is not that necessary, it could have come from m left shoulder.

However, right sided regulator hose is helpful because we all get used to it !

Watch the Video Below to See the OTS Guardian Full Face Mask In Action!

Adjustable Strap System

Just like the majority of the full face masks, OTS Guardian Full Face Mask has a two straps (also called spider strap).

You can easily adjust the straps by using the buckles. This way, your OTS Guardian Full Face Mask fits 100%.

The spider strap will readjust itself during your descent/ascend. That is a really helpful issue.

What is good with OTS Guardian Full Face Mask’s buckles is their stability. They made of hard plastic, so it looks like it takes a long period to wear.

In addition, because buckles are made of hard plastic rather than metal, they never rust! Rusting buckles are nightmares because they last very soon.

When your buckles get old enough, you can change it easily.

Surface Ambient Air BreathingOTS Guardian Full Face Mask3

This feature is what I like most with OTS Guardian Full Face Mask.

On the surface, you can save your gas by using Surface Ambient Air Breathing System (functions like a snorkel).

When opened, you breath the air outside your mask when you are on the surface then you close the valve and start to descend, switch back to the tank breathing.

When the Surface Ambient Air Breathing System is opened, there is only a one-way gas exchange. The valve takes the air in the mask, but you exhale through your second stage. This helps to get rid of Co2 in your mask.

Even if you forget to close your Surface Ambient Air Breathing System, the valve closes itself due to the increasing pressure. However, it gets a little bit of harder to breath. This is how you realize that you have forgotten to close your system and do it easily.

Surface Ambient Air Breathing System is a little wheel outside your mask (near your right eye). It is very easy to reach it!

OTS Guardian Full Face Mask Second Stage

The second stage is designed for full face mask.

You can breath easily, without force.

Mounting it to the OTS Guardian Full Face Mask is easy and demounting is even easier by the help of a single button.

There is a notch system to help you align your second stage on your OTS Guardian Full Face Mask. Then you lock it!

There are two exhaust ports on the left of the second stage. Not being at the bottom of the second stage, you see no bubbles during your dives.

Purge button is large enough and I didn’t find it hard to purge the second stage.

OTS Guardian Full Face MaskStoring Your OTS Guardian Full Face Mask

OTS Guardian Full Face Mask is a good looking mask, however it has an even better looking bag to store it.

It comes free with the purchase.

This bag looks like a regulator bag but it is thicker.

It gives your OTS Guardian Full Face Mask the best drying position.

You can either use the handle or shoulder strap to carry your full face mask.

Color Options

Yes ! Color is life!

Just like every one of us, equipment should also be colorful.

There are 7 color choices in

I personally loved the blue-black version.

Buy OTS Guardian Full Face Mask From

Want to Communicate With Your Buddy?

If you want talk underwater, you can use the communication model of OTS Guardian Full Face Mask.

Below are the features of the communication system:

  • 50 to 500 meters of range depending on the sea condition
  • Upper single sideband (USB) used with Transmission Type Ultrasound
  • 1/2 Watt PEP of Transmission Power
  • Standard frequency Freq. A : 32.768 kHz USB
  •  Earphone Ceramic Microphone ME-16R Hot-Mic
  • Alkaline 9V or Ultralife lithium 9V Battery Type (batteries are not included when purchased)
  • 130 feet (almost 40 meters) of maximum operating depth

What Does Seaman Say?OTS Guardian Full Face Mask2

First of all, this is one of the unique products that I suggest to everyone.

You’ll not suffer any jaw fatigue and/or dry throat.

This mask doesn’t fog due to the air system.

Adjustable equalizing kit helps every diver to equalize without effort.

Color options are beautiful.

Because there is always positive pressure in the mask, flooding is not an option. But if it happens somehow, you can easily clear your mask with a single purge button.

Ambient Breathing Valve is a great add-on to save air.

The only con for OTS Guardian Full Face Mask is the price.

It seems to be a little bit of expensive, but the cost benefit ratio does the math!

I advice all the divers to purchase OTS Guardian Full Face Mask, but don’t forget to take a full face mask course before starting to use this great mask.

Buy OTS Guardian Full Face Mask From

Get more stuff like this

Subscribe to our mailing list and get interesting stuff and updates to your email inbox.

Thank you for subscribing.

Something went wrong.

Share this:

About Seaman


Hi, my name is Murat Demirağ. I have been diving since 1996 and teaching scuba since 2005. I wanted to share my knowledge through

  • Website
  • Instagram
  • Email


  • Taylor
    2015-08-06 20:50

    can you vomit in this mask safely?

    • Seaman
      2015-08-07 14:19

      Hello Taylor,

      Thanks for commenting.

      Yes, you can vomit in this mask safely. In fact, not only in OTS Guardian Full Face Mask but in all full face masks.

      What you have to do is to clear your mask just like you clear your regular mask.

      Tap the frame of your mask and exhale sharply from your nose.


  • Dave Cress
    2016-11-25 15:43

    Do you clean out or burn the film layer out on this mask like conventional masks?

    • Seaman
      2016-11-25 16:24

      Hello Dave,

      Welcome to

      Yes, same rules are applied.


Add Comment