O’Neill Men’s Thermo X Long Sleeve Insulative Rash Guard Review

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$70.15
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O’Neill certainly knew what they were doing when they designed the Thermo X Insulative Top. The material is a 220g mix of nylon and spandex that’s soft, stretchy, low-bulk, quick-drying, water repellent, and odor resistant.

We love that it’s thin enough to fit under a wetsuit and the neckline is low cut so doesn’t interfere with the neck of your suit. For surfers, there are seamless paddle zones and boardshort connectors.

There is also a women’s version of the Thermo X, which you can find here. This reviewer has been using hers heavily for more than three years and the rash guard is still in excellent condition.

The O’Neill Thermo X is a top choice rash guard and swim shirt no matter what outdoor or water activities you’re doing. You will not be disappointed.

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2 retailers compared · Checked 20 hours ago

Lowest price right now $70.15
Amazon logoAmazon
In stock
Prime: Same-Day to Two-Day on millions of items
$70.15
Buy now
We only list shops we would buy from ourselves This price grid only shows retailers we trust: shops we vet on returns, delivery, and what real customers say about them. All prices are checked daily. We earn a commission from some of the shops when you buy through these links, at no extra cost to you.
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Excellent · verified retailer
DIVEIN's take
Why buy from Scuba.com?

Scuba.com is a specialist dive retailer, and multiple buyers describe responsive, practical help when an order or product issue needs attention. Several also report orders arriving quickly or in time for when they were needed.

What buyers say

Several buyers describe responsive replies and practical help when an order or product issue needed attention. They describe support that answers quickly and stays helpful.

Multiple buyers also report orders arriving quickly or in time for when they were needed. Delivery timing is the positive point they describe.

Worth knowing

Some buyers report slower replies or more follow-up than expected when they needed help after ordering. Others describe delivery problems after ordering. Keep the order confirmation and tracking details until the item actually arrives.

DIVEIN editorial team
Shop reputation
4.7
Google · 1,555 reviews · 2 platforms checked
checked August 31, 2026
Accepted payments
VISAAMEXDiscoverG Pay

Checkout on scuba.com is served over a secure SSL (https) connection.

Shipping & returns
Free Super Saver shipping on logo items; no minimum; US 48 states. Some fees may apply. Ships from US Eligible returns: 30 days for a full refund; days 31–90 for exchange or store credit if unused. Original shipping charges aren't refunded.
Visit Scuba.com
Amazon logo
DIVEIN's take
Why buy from Amazon?

Amazon has a documented Prime delivery program that covers millions of items, and that is the most concrete order-related support behind buying here.

Worth knowing

Some customers report slower replies or needing more follow-up than expected when they asked for help after ordering. If an order needs post-purchase support, that part of the experience is not always smooth.

Some customers also report delivery problems after ordering. That keeps follow-up and delivery as the areas to watch if you place the order here.

DIVEIN editorial team
Accepted payments
VISAAMEXDiscover

Checkout on amazon.com is served over a secure SSL (https) connection.

Shipping & returns
Free shipping on eligible orders meeting the minimum threshold. Ships from Amazon fulfillment centers or third-party sellers, depending on the listing; seller-shipped items may take longer. Most items sold on Amazon.com may be returned within 30 days of delivery; exceptions apply.
Visit Amazon

Specs & Features

Material220g Nylon/Spandex mix
Thermal protectionYes
Sun protection50+ UPF
SleevesLong sleeves
Boardshort connectorBoardshort connectors
DryingQuick-dry material
SeamsFlatlock seams
Designed forSpecifically designed for men and women.

Compare prices

2 retailers compared · Checked 20 hours ago

Lowest price right now $70.15
Amazon logoAmazon
In stock
Prime: Same-Day to Two-Day on millions of items
$70.15
Buy now
We only list shops we would buy from ourselves This price grid only shows retailers we trust: shops we vet on returns, delivery, and what real customers say about them. All prices are checked daily. We earn a commission from some of the shops when you buy through these links, at no extra cost to you.
Scuba.com logo
Excellent · verified retailer
DIVEIN's take
Why buy from Scuba.com?

Scuba.com is a specialist dive retailer, and multiple buyers describe responsive, practical help when an order or product issue needs attention. Several also report orders arriving quickly or in time for when they were needed.

What buyers say

Several buyers describe responsive replies and practical help when an order or product issue needed attention. They describe support that answers quickly and stays helpful.

Multiple buyers also report orders arriving quickly or in time for when they were needed. Delivery timing is the positive point they describe.

Worth knowing

Some buyers report slower replies or more follow-up than expected when they needed help after ordering. Others describe delivery problems after ordering. Keep the order confirmation and tracking details until the item actually arrives.

DIVEIN editorial team
Shop reputation
4.7
Google · 1,555 reviews · 2 platforms checked
checked August 31, 2026
Accepted payments
VISAAMEXDiscoverG Pay

Checkout on scuba.com is served over a secure SSL (https) connection.

Shipping & returns
Free Super Saver shipping on logo items; no minimum; US 48 states. Some fees may apply. Ships from US Eligible returns: 30 days for a full refund; days 31–90 for exchange or store credit if unused. Original shipping charges aren't refunded.
Visit Scuba.com
Amazon logo
DIVEIN's take
Why buy from Amazon?

Amazon has a documented Prime delivery program that covers millions of items, and that is the most concrete order-related support behind buying here.

Worth knowing

Some customers report slower replies or needing more follow-up than expected when they asked for help after ordering. If an order needs post-purchase support, that part of the experience is not always smooth.

Some customers also report delivery problems after ordering. That keeps follow-up and delivery as the areas to watch if you place the order here.

DIVEIN editorial team
Accepted payments
VISAAMEXDiscover

Checkout on amazon.com is served over a secure SSL (https) connection.

Shipping & returns
Free shipping on eligible orders meeting the minimum threshold. Ships from Amazon fulfillment centers or third-party sellers, depending on the listing; seller-shipped items may take longer. Most items sold on Amazon.com may be returned within 30 days of delivery; exceptions apply.
Visit Amazon
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