Whale Shark Long Sleeve Rashguard – UPF 50 Swim Shirt

Name: Whale Shark Long Sleeve Rashguard – UPF 50 Swim Shirt
Brand: Oceans Optics
SKU: 32076940001093578712
Price: 60.00 USD
Availability: InStock

Inspired by the world's largest fish, this rashguard captures the wonder of seeing a whale shark beneath the surface.

Lightweight, stretchy, and quick-drying with UPF 50 sun protection, it's built for long days spent snorkeling, swimming, paddling, and exploring the water. The tag-free fit, raglan sleeves, and underarm gussets help reduce chafing and provide all-day comfort, whether worn on its own or layered under a wetsuit.

Designed for those who believe the best days are spent in the water, discovering what lies beneath the surface. 🌊🐋🦈

Quantity

$60.00 USD

SALE Sold out

Shipped with Care. No Hidden Fees. Just Clear Vision Ahead.

	XS	S	M	L	XL	2XL	3XL	4XL
Body Length at Back, cm	67.31	69.85	72.39	74.93	77.47	80.01	81.28	82.55
Chest, cm	45.09	48.90	51.75	54.61	58.42	62.23	67.31	72.39
Sleeve Length from Center Back, cm	83.19	85.09	87.00	88.90	90.81	92.71	94.62	96.52

Product Features

UPF 50 sun protection to shield skin during long days on the water.

Stretchy 90/10 poly/spandex (5.9 oz) fabric for full range of motion.

Quick-dry, breathable construction with moisture management.

Trim, comfortable fit with raglan sleeves and underarm gussets for flexibility

PosiCharge color retention and tag-free label for all-day comfort.

Care Instructions

Care instructions
- Machine wash: cold (max 30C or 90F)
- Non-chlorine: bleach as needed
- Tumble dry: low heat
- Iron, steam or dry: low heat
- Do not dryclean

Shipping & Delivery

Shipped with care - Delivered within 5-10 days.

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.

View full details

SUN PROTECTION CLOTHING

Block the sun. Not the experience.

Limited edition marine designs with UPF 50 protection, quick-dry fabric, and a fit built for full movement in and out of the water.

rashguard S / White Whale Shark Long Sleeve Rashguard – UPF 50 Swim Shirt Whale Shark Long Sleeve Rashguard – UPF 50 Swim Shirt

UPF 50+ Protection

Helps protect skin from harsh UV rays

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Quick-Drying

Made for comfort in and out of the water

rashguard Sea Turtle Long Sleeve Rashguard – UPF 50 Swim Shirt Sea Turtle Long Sleeve Rashguard – UPF 50 Swim Shirt

Underarm Gusset

Helps reduce rubbing and chafing

rashguard Manta Ray Long Sleeve Rashguard – UPF 50 Swim Shirt Manta Ray Long Sleeve Rashguard – UPF 50 Swim Shirt

Ocean Barrier Layer

Helps reduce contact with minor sea irritants

Your Rashguard Will Help to Build a Reef!

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

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

Snorkeler wearing a twin-lens mask over a coral reef

MORE THAN JUST A MASK

Your Free Snorkeling Learning Hub

MORE THAN JUST A MASK

Your Free Snorkeling Learning Hub

At Oceans Optics, we believe the right gear is only part of the experience. Knowing how to use it, what to look out for, and how to feel confident in the water matters just as much.

Built by Professional Instructors

Explore lessons on:

Gear & Vision

Safety & Conditions

In-Water Skills

Underwater Science & Your Body

Marine Life & Conservation

Free to explore. Easy to follow. Built to help you snorkel with more confidence.

EXPLORE THE LEARNING HUB

Rx Lens Strength + Face Fit

Find Your Prescription Mask Quiz

Built specifically for prescription snorkel and dive masks, this quiz helps match your lens strength, face fit, and intended use in one simple flow.

Answer up to 6 quick questions in about 2 minutes.

Start the quiz →

Have your prescription nearby if you know your numbers. If not, no problem, we can still guide you.

Lens strength Face fit Snorkel or dive

4.94 / 5 based on 1246 verified reviews

Your prescription image is only used to read your values. It is never stored.

Get ready for your next adventure

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Frequently Asked Questions

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 lenses are sphere only, meaning they correct SPH but not CYL directly. You can still see a significant improvement. Use your SPH for each eye, then adjust based on your CYL value and sign.

Important: The + or − sign on your CYL matters. Check your prescription slip for the sign next to your CYL value.

Nearsighted (Minus −) lenses

CYL 0.00 to 0.75: Go 0.50 weaker than your SPH (closer to zero). The CYL sign has little impact at this level.
CYL 1.00 to 1.75 with minus CYL (−): Stay close to your SPH. You can go up to 0.50 stronger (further from zero) or up to 0.50 weaker (closer to zero).
CYL 1.00 to 1.75 with plus CYL (+): Stay close to your SPH. You can go up to 0.50 weaker (closer to zero) or stay at SPH.
CYL 2.00 to 3.00 with minus CYL (−): Stay exactly at your SPH. Only go 0.50 stronger if you specifically want sharper detail.
CYL 2.00 to 3.00 with plus CYL (+): Stay exactly at your SPH. Do not go weaker.
CYL 3.25+ with minus CYL (−): Move slightly toward stronger correction, rounded to the nearest 0.50 step.
CYL 3.25+ with plus CYL (+): Move slightly toward weaker correction, rounded to the nearest 0.50 step.

Special case: If your SPH is −0.50 or −0.75 and CYL is 2.50 or higher, start at −1.00.

Farsighted (Plus +) lenses

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

CYL 0.00 to 0.75: Round to the nearest whole number toward zero.
CYL 1.00 to 1.75 with minus CYL (−): Round to nearest whole number, or one step stronger for sharper detail.
CYL 1.00 to 1.75 with plus CYL (+): Round down to the nearest whole number.
CYL 2.00 to 3.00: Stay at your SPH rounded to the nearest whole number.
CYL 3.25+ with minus CYL (−): Move toward stronger correction, round to nearest whole number.
CYL 3.25+ with plus CYL (+): Move toward weaker correction, round to nearest whole number.

Special case: If your SPH is +0.50 or +0.75, start at +1.00 regardless of CYL.

Use our Underwater Lens Calculator for an instant recommendation, or see our full guide: Choosing prescription snorkel mask lenses with astigmatism.

If you are unsure, upload your prescription and we will 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.

Whale Shark Long Sleeve Rashguard – UPF 50 Swim Shirt

Product Features

Care Instructions

Shipping & Delivery

Returns Policy

More than JUST a Mask!

Block the sun. Not the experience.

UPF 50+ Protection

Quick-Drying

Underarm Gusset

Ocean Barrier Layer

Your Rashguard Will Help to Build a Reef!

Your Free Snorkeling Learning Hub

Your Free Snorkeling Learning Hub

Customer Reviews

Find Your Prescription Mask Quiz

Frequently Asked Questions