O'Neill Men's Thermo-X Long Sleeve Insulating Rashguard O'Neill Men's Thermo-X Long Sleeve Insulating Rashguard O'Neill Men's Thermo-X Long Sleeve Insulating Rashguard
Best Seller

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

Price Match Guarantee
Add to cart
Block out the cold in the O'Neill Men's Thermo-X Long Sleeve Insulating Rashguard. Featuring a layered fabric... Read More
SKU: 5022 Product Code: 8161301

Product Details

  • Also seen in:

    Beach Shop
    Surf Shop

    Got a Question?

    Ask here!

    Block out the cold in the O'Neill Men's Thermo-X Long Sleeve Insulating Rashguard. Featuring a layered fabric construction that provides insulation with low bulk and quick-drying properties, this 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.


    • 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.

Top Thermals

Questions & Answers

Need an answer fast? Contact our customer service team.


Please let us know what kind of issue this is:
  • {{flag.text}}


  • 4.5 Review Stars (7 Reviews)

    Write A Review

    See all 7 customer reviews
  • 11/6/2020 Warm & Flexible

    5 Review Stars By Chris Deger

    Easy to care for, warm, fits well, like it, I bought two.

    Chris Deger
    Rolling Meadows, IL

  • 9/23/2020 disappointed

    2 Review Stars By Allan

    my main disappointment is that it was extremely hard to get it off once wet.


    Fit: Feels too small

  • 9/10/2020 Great for New Hampshire swim

    5 Review Stars By Jeff

    I live in southern NH. This is really well insulated. I expect I can swim through much of September. I have a triathlon wet suit but it’s so buoyant I float more than swim. This rash guard allows for a real workout.

    Swanzey, NH

    Fit: Feels true to size

  • 7/1/2020 Just what I needed

    5 Review Stars By Nor

    This is just what I was looking for. Very fuzzy and warm but light weight/non bulky. They don’t have them in women sizes (or at least I couldn’t find them) so I ordered down a size. I normally wear women’s large/medium, so I ordered men’s small. It is form fitting but that’s what you want. It doesn’t feel tight.


    Fit: Feels true to size

  • 1/28/2020 Warm and comfortable

    5 Review Stars By Del

    This thermal rash guard is warm and comfortable for chilly mornings. Our Florida temperatures have dipped as low as 39 degrees and I have used it especially for my warmup drills as I gather up the nerve to swim my laps. I bought a Large and I am 5''10", 170 lbs. It is not too tight for drag and sized correctly so as not to inhibit movement. This is the best purchase for early morning laps.

    The Villages, FL

    Fit: Feels true to size

  • 5/5/2018 Great product

    5 Review Stars By Tom

    This thermal top maintains body heat while in cool water temperatures.
    Highly recommend.

    Charlotte, NC

    Fit: Feels true to size

  • 2/12/2018 Just what I needed

    5 Review Stars By Bob

    I snorkel a lot, and have tried rash guards, neoprene tops, and other options. This is really the perfect solution to add warmth without bulk. It dries quickly. Very satisfied.

    Syracuse NY

    Fit: Feels true to size

  • Top Valid Form
    Validate Warning
    Email Address Invalid. Please enter an email address in the format: xx@yy.zz
    Validate Close

More From O'NEILL

About This Brand


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.