Seabeast mask adapts with highly-qualified materials. The silicone material is soft and flexible. The silicone skirt creates the seamless seal between your face and the mask. However, the measurement cannot be ignored. It’s known that our faces are in various shapes and sizes. Seabeast full face snorkel mask comes in two standard sizes that can cover most faces for men, women.
- Size S/M for adults with thin faces, women;
- Size L/XL for adults male.
The range of sizes can cover about 90% of the population, so there is a small chance you won’t fit the mask comfortably.
A comfort mask is not only about the length of your face, the width of your face, but also about the size of your nose.
If your face is wider than most, you may find the mask is fine, but it may be not that secure. If your nose is bigger than normal size, it’s quite difficult for you to purchase a suitable full face snorkel mask. Most full face snorkel masks will rub on the bridge of your nose, which will cause discomfort and affect your breathing.
To make the most of your Seabeast mask, it’s critical to choose the right size for your face. Too small size won’t provide comfort, and too big size leads to leakage.
Seabeast AF90 | S/M | L/XL |
![]() ![]() | 3.9’’<size<4.7’’ 10 cm<<size<12 cm | size>4.7’’ size>12 cm |
Measure your face as shown in the diagram below
The length of your face is the straight line and not over the nose.
- If it measures less than 3.9″, you will need size extra small size. Unfortunately, you can not use a Seabeast mask.
- If it measures between 3.9″ and 4.7″, then you will need a size S/M (small/medium).
- If it measures 4.7″ or more, then you will need size L/XL (large/extra large).
- If it measures exactly 4.7″, then choose size S/M, or if you feel you may need a larger size in the future then choose size L/XL.
- If you are still uncertain, please select a smaller size.
The bridge of your nose is that top bit between your eyes.

TIPS FOR PUTTING YOUR SEABEAST MASK ON CORRECTLY
To put on a size S/M (or L/XL) mask, it’s important to position your chin inside the mask as shown:
When you receive your Seabeast mask, put it on to check that there is no space between your chin and the bottom of the mask.
All information you need to know about a full face snorkel mask is here.

Still hesitating if a full face snorkel mask is for you?
Seabeast AF90 is the first real 100% anti-fog full face snorkel mask. Its outstanding anti-fogging performance has won snorkelers’ recognition.
THE WALL STREET JOURNAL comments on Seabeast AF90 “provide especially good visibility; Its snorkel also folds for easy packing ($60, myseabeast.com).”



“I bought 2 of those masks and tested it on my current vacation on Big Island Hawaii.
They do not joke when they said that there is no fogging.
It is an amazing product that even person who never did any snorkeling can use without any training.
You simply feel like you have a full face scuba diving equipment. I highly recommend this product, because for extra 20$ you are getting top-notch gear.”
“pros–fit like a glove. the silicone lining seals around the face tightly. the view is wide and clear. breathing is a lot easier than with regular mask.
cons–a bit heavier than anticipated. although the breathing is good, I can see how CO buildup over extended time in water might pose an issue. I never used it for more than a 15-minute stretch.”


Don’t fog, wide view and easier to breath
“We use the mask for our excursion in Bali and in the Dominican Republic. And both times, I would give a high mark for how clear the mask is and how easy is it to use. … The tube also has this preventive mechanism where it closes right away as soon as it goes under water. If the water goes in, it will go to a different part of the mask and you just have to come up from the water and let it out. Another wonderful feature of the mask is the screen. It’s made from a material that does not get foggy easily. Throughout my snorkeling experience, I never had to wipe the screen at all. And the clear screen also extends to the side of your face, so you get a wider view. If you like snorkeling like we do, I would recommend this mask.”