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.

Our Overall Review

We have thoroughly tested - and read reviews from other experts and users. In summary, this is what we think:

3.8

Where to buy:

Oneill Mens Thermo X Long Product Image

O’Neill Men’s Thermo X Long Sleev Insulative

Specs & Features

  • Material: 220g Nylon/Spandex mix
  • Thermal protection? Yes
  • Sun protection? 50+ UPF
  • Long sleeves
  • Boardshort connectors
  • Quick-dry material
  • Recom
  • Flatlock seams
  • Specifically designed for men and women.
See the complete list of the best Rash Guards here!

Related Reviews

Our Overall Review

We have thoroughly tested - and read reviews from other experts and users. In summary, this is what we think:

3.8

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