O'Neill Men's Thermo-X Short Sleeve Insulating Rashguard O'Neill Men's Thermo-X Short Sleeve Insulating Rashguard O'Neill Men's Thermo-X Short Sleeve Insulating Rashguard

O'Neill Men's Thermo-X Short Sleeve Insulating Rashguard

Product Rating   5 Review Stars

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SKU: 5021
Product Code: 8161302
Availability: Usually Ships in 24 Hours
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  • Block out the cold in the O'Neill Men's Thermo-X Short Sleeve Insulating Rashguard. Featuring a layered fabric construction that provides insulation with low bulk and quick-drying properties, this short sleeve rashguard features a DWR coating with odor resistance to keep you fresh and comfortable, while the 4-way stretch fabric gives you maximum flexibility.



    • Nylon / Spandex.



    • Short sleeve rashguard.
    • Thermo-X Hyperdry:
      ​- Max insulation with minimal water absorption and a DWR coating.
    • Seamless Paddle Zones:
      - Flexible design which utilizes minimal seam placement for comfort.
    • UPF 50+ sun protection.
    • Odor resistance.
    • 4-way stretch fabric.
    • Boardshort connector.
    • Rash protection.
    • Low neck that won't interfere with wetsuit neck.


    Sizing & Fit

    • Tight Fit.


    Country of Origin

    • Made in China.


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  • 5 Review Stars (2 Reviews)

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  • 1/22/2018 Product is as advertized

    5 Review Stars By Philip

    I was looking for a little more insulation. I was trying to replace my instotherm body glove. The thermo x fits and wears well,but holds a lot of water when you get out of the pool.


    Fit: Feels true to size

  • 12/5/2017 Glad I bought these

    5 Review Stars By Austin

    I use them for exercising in an outdoor pool early in the morning.  My exercises consist of my uppermost body starting with my shoulders up being out of the water.   They work very well for keeping  me comfortable in the water especially when there is a breeze blowing.

    Their sizing chart is true to size.

    Austink TX

    Fit: Feels true to size

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More From O'NEILL



Jack O'Neill began surfing in 1952, before functional surf apparel was invented. While working for the Army Air Corps, O'Neill discovered neoprene foam in a DC-3 airplane. He then combined the neoprene carpeting with duct tape to create the first neoprene wetsuit.

Demand for O'Neill's neoprene wetsuits grew rapidly and he began a business selling the O'Neill wetsuits out of his garage. By 1980, he was a leader in the beach apparel industry with a thriving business. Since then, O'Neill™ has become a widely recognized and respected brand in the surf industry, continually creating new and innovative products. In addition to O'Neill wetsuits, they carry O'Neill boardshorts, O'Neill dresses, O'Neill hats, O'Neill rash guards, O'Neill swimsuits, O'Neill water shoes, O'Neill sandals, O'Neill life jackets and O'Neill t-shirts.

In addition to his business success, O'Neill also created a non-profit foundation for kids. O'Neill developed the O'Neill Sea Odyssey Program: a free, educational cruise that introduces kids to the microbiology of the Monterey Bay Marine Sanctuary, beginning at Jack O'Neill's doorstep.