Your T-Shirt Helps Build a Reef!

Size	S	M	L	XL	2XL	3XL	4XL	5XL
Width (in)	18	20	22	24	26	28	30	32
Length (in)	28	29	30	31	32	33	34	35
Sleeve (in)	15.1	16.5	18	19.5	21	22.4	23.7	25
Size tolerance (in)	1.5	1.5	1.5	1.5	1.5	1.5	1.5	1.5

When you buy from Oceans Optics, you are not just getting a cool ocean Tee, you are helping us build real living coral reefs.

A portion of every sale goes toward our artificial reef project in Koh Tao, Thailand. We worked with Global Reef and the Thai Department of Marine & Coastal Resources to sink a custom steel structure shaped like a prescription scuba mask. Onto this frame we attach living coral fragments that grow over time, attracting fish and turning the structure into a living reef and safe haven for marine life.

So each time you wear your shirt, you are also actively giving back to the ocean we all love.

Learn More

Frequently Asked Questions

Name: I Can Sea Mexico Watercolor Field Guide Tee - Mexican Fish ID Shirt
Brand: Printify
SKU: 25025725870301478365
Price: 31.5 USD
Availability: InStock

What is the difference between nearsighted and farsighted lenses?

Nearsighted (Myopia) lenses: Negative SPH values (example: -2.50) to help you see clearly at distance.

Farsighted (Hyperopia) lenses: Positive SPH values (example: +2.50) to help with close-up vision.

How do I find the sphere (SPH) value on my prescription?

Look for the column labelled SPH or Sphere. It can also be labelled Power or PWR. A minus sign (-) is nearsighted. A plus sign (+) is farsighted.

How should I adjust my prescription for clear vision underwater?

Underwater adjustment: For most people, choosing a lens that is 0.50 diopters weaker (towards zero) than your normal SPH gives the best comfort and clarity underwater.

Why: Water creates natural magnification, and mask lenses sit further from your eyes than glasses. Reducing by 0.50 helps keep vision feeling natural and comfortable underwater.

Examples: If your SPH is -2.25, choose -2.00. If your SPH is -2.75, choose -2.50.

Our lenses are available in 0.50 increments, so choose the closest available option.

I have astigmatism (CYL). What should I choose?

Our standard prescription options are based on SPH (sphere). If you have astigmatism (CYL), the sign does not matter. Use the CYL number (for example, treat -2.00 and +2.00 the same).

Nearsighted (Minus -) lenses

CYL 0.00 to 0.75: Start 0.25 to 0.50 weaker than SPH (towards zero), then select the closest available option.
CYL 1.00 to 1.75: Start at SPH or 0.25 weaker max.
CYL 2.00 to 3.00: Start at SPH. (Some people choose slightly stronger for sharpness, but comfort-first starts at SPH.)
CYL 3.25+: Start at SPH. (Comfort-first starts at SPH.)

Farsighted (Plus +) lenses

Our farsighted lenses are available in whole steps only: +1.00, +2.00, +3.00, +4.00, +5.00.

CYL 0.00 to 1.75: Round down to the nearest whole number for comfort (towards zero).
CYL 2.00+: Round to the nearest whole number with a comfort tie break:
- If SPH ends in .25 or .50, round down
- If SPH ends in .75, round up

Special cases (Plus +): If your SPH is +0.50 or +0.75, we recommend starting with +1.00.

If you want the full explanation and examples, see our guide: Choosing prescription snorkel mask lenses with astigmatism .

If you are unsure, upload your prescription and we will quickly check your selection for you.

I can’t find my lens strength in the dropdown. What should I do?

The dropdown shows all strengths available for that specific mask. If your exact number is not listed, choose the closest available option using the guidance above.

If you want us to confirm the best match, upload your prescription on the product page or email us at info@oceansoptics.com.

Can I choose different lens strengths for each eye?

Yes. You can select different strengths for left and right eye. You can mix and match any combination available in the dropdown menu.

How do I upload my prescription during checkout?

On the product page you can optionally upload your prescription so we can check your selection before we build it. You can also leave a note in the cart, or email us at info@oceansoptics.com.

How do I stop my mask from fogging?

A simple method is the toothpaste trick. Rub a small amount of toothpaste on the inside of each lens using circular motions for a few minutes, then rinse thoroughly. Do this before your first use (and repeat if needed).

Before each session, you can also use a tiny amount of baby shampoo or dish soap mixed with water. Rub a thin film on the inside of the lens, then lightly rinse so a fine layer remains.

Do you have a guide to help me use my mask properly?

Yes. Here is our Mask 101 guide: Open Mask 101 (PDF).

What happens if I accidentally choose the wrong lens strength?

Message us as soon as possible. If the order has not entered the build or shipping stage yet, we can usually update the lens selection.

Are your lenses safe for both snorkeling and scuba diving?

Yes. Our lenses are HD tempered glass and are suitable for snorkeling and scuba diving up to 100 ft (30 m).

How long does delivery take, and can I track my order?

Most orders arrive in 5 to 10 days, but we recommend allowing up to 14 days to be safe. You will receive a tracking number by email once your order ships.

What is your return or exchange policy for prescription masks?

Your satisfaction, guaranteed.
You have 30 days from delivery to request a return, as long as the item is unworn, unused, with tags, and in original packaging. For full details, visit our Return Policy.

I Can Sea Mexico Watercolor Field Guide Tee - Mexican Fish ID Shirt

I Can Sea Mexico Watercolor Field Guide Tee - Mexican Fish ID Shirt

Size Guide

Specifications

Care Instructions

Shipping & Delivery

Returns Policy

Eligible items only. For more info see our Return policy.

More than JUST a Mask!

At Oceans Optics, we’re committed to clear vision and unforgettable underwater experiences. That’s why every order includes Snorkeling 101 – Your Ultimate Guide to Better Aquatic Adventures!

Get expert tips instantly after checkout or via email, and dive in with confidence.

Your T-Shirt Helps Build a Reef!

Free Find My Mask Quiz

Take a quick quiz to find your perfect fit

Customer Reviews

Get ready for your next adventure

2L Dry Bag Touch Screen Waterproof Bags

2L Dry Bag Touch Screen Waterproof Bags

Nearsighted Prescription Swim Goggles with Anti-fog & UV protection

Nearsighted Prescription Swim Goggles with Anti-fog & UV protection

HydroFlats Quick Drying Water Shoes Non Slip Rubber Sole

HydroFlats Quick Drying Water Shoes Non Slip Rubber Sole

Travel Snorkel Fins

Travel Snorkel Fins

Fintastic Adjustable Fins for Scuba Diving Snorkeling

Fintastic Adjustable Fins for Scuba Diving Snorkeling

RX Elite Myopia Swimming Goggles with Anti-Fog Earplugs

RX Elite Myopia Swimming Goggles with Anti-Fog Earplugs

Mesh Drawstring Backpack Beachbag Snorkel bag

Mesh Drawstring Backpack Beachbag Snorkel bag

Inflatable Dry Bag Float Buoy

Inflatable Dry Bag Float Buoy

Frequently Asked Questions

Country/region

I Can Sea Mexico Watercolor Field Guide Tee - Mexican Fish ID Shirt

I Can Sea Mexico Watercolor Field Guide Tee - Mexican Fish ID Shirt

Size Guide

Specifications

Care Instructions

Shipping & Delivery

Returns Policy

Eligible items only. For more info see our Return policy.

More than JUST a Mask!

At Oceans Optics, we’re committed to clear vision and unforgettable underwater experiences. That’s why every order includes Snorkeling 101 – Your Ultimate Guide to Better Aquatic Adventures!

Get expert tips instantly after checkout or via email, and dive in with confidence.

Your T-Shirt Helps Build a Reef!

Free Find My Mask Quiz

Take a quick quiz to find your perfect fit

Customer Reviews

Get ready for your next adventure

Frequently Asked Questions