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

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Layer up for the coldest waves in the O'Neill Women's Thermo-X Long Sleeve Insulating Rashguard. Featuring Thermo-X... Read More
SKU: 5025 Product Code: 8161304

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    Layer up for the coldest waves in the O'Neill Women's Thermo-X Long Sleeve Insulating Rashguard. Featuring Thermo-X Hyperdry fabric that provides maximum insulation, this rashguard keeps your core and arms warm and protects you from rashes. Layer under a wetsuit for next-level warmth and insulation.


    • 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.

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  • 4.5 Review Stars (35 Reviews)

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  • 12/27/2020 Love my rashguard!

    5 Review Stars By Nikki

    I bought this for pool/lap swimming, as I’m always so cold in the pool. It’s been a game changer, no more shivering through my workouts. I live in a Chicago, so the idea of getting up early, in the dark, when it’s 20 degrees outside to head to the chilly pool is not ideal, but having this thermal gets me up and out! Definitely recommend! I can’t wait to test it out under my wetsuit when I open water swim!


  • 3/6/2018 Great for keeping warm in windy and chilly HI ocean!

    5 Review Stars By Beach goer

    I bought this shirt for swimming in colder Hawaiian ocean during winter and windy months.  This totally fit the bill.  I am 5'3", 123lbs and I bought the medium.  Fits perfectly, not too loose and not too tight. Flatters curves, does not hang, full range of motion.  I can be wet and walking on the beach too with the wind howling and this shirt keeps me warm!

    Beach goer
    Big Island, Hawaii

    Fit: Feels true to size

  • 12/26/2020

    5 Review Stars By Walt Buchwald

    Great fabric great sizing fast shipping. Gift item. Now know what this family member likes.

    Walt Buchwald
    2208 Morgan Ct. Grayslake IL 60030

  • 1/16/2018 Brilliant Alternative to Wetsuit Jacket

    5 Review Stars By Katy

    I live in Hawaii and I've been searching for the perfect wetsuit top that will provide some warmth protection during our winter months for surfing.  The water temp is pretty warm here, even in the winter, but it can get chilly with the wind.  I have not been able to find the right wetsuit jacket/top.  They all restrict movement too much, have a zipper on the front that hurts while paddling, or stretch out after some use.

    I ordered this top thinking that I could wear it under my wetsuit jacket because my jacket has stretched out even though I've only been using it for a few months.  This insulating rashguard is BRILLIANT.  It keeps me plenty warm without needing to put the wetsuit jacket over it, and it allows full range of motion.  It is far superior to the 1-2mm wetsuit jackets for when minimal warmth protection is needed.  I wish I had found this sooner!

    I am 5'6", 125 lbs and the Small is a perfect fit.

    Kula, HI

    Fit: Feels true to size

  • 12/15/2020 Great Rashgaurd

    5 Review Stars By BMH

    Keeps me warm in the outdoor pool in the cooler months.

    Ventura, CA

    Fit: Feels true to size

  • 2/8/2018 Amazing rashguard

    5 Review Stars By C Carleen

    This rashguard keeps me warmer than any other I have ordered probably because it is insulated.   It is so comfortable when I swim.  It literally moves with me doing laps.  It has lasted longer than any other rashguard I have ordered.  I ordered another one because I love it so much.

    Thank-you O'Neil swimwear and SWIMOUTLET !!

    C Carleen
    Palos Heights, IL

    Fit: Feels true to size

  • 10/30/2020 A little extra warmth

    5 Review Stars By Junie

    I ordered a small which was perfect for me [OPENBRK]usually a size 4[CLOSEBRK]
    I like the added warmth for short ocean swims before getting out the full wetsuit.

    Mystic CT

  • 9/20/2018 Really happy with this purchase!!

    5 Review Stars By SwimMichigan

    I swim in Lake Michigan in the summertime and wanted something to take the chill off without restricting movement. I've used this all summer and I LOVE it. It fits really well - snug but soft and not constricting. I am tall and the sleeves are plenty long. I do not feel like it limits my arm movements at all. It has made my swims really enjoyable this year. Thank you for making this!


    Fit: Feels true to size

  • 9/26/2020 Runs small

    5 Review Stars By Jackie

    Feels comfortable because of the quality of the fabric!

    Oakland, CA

  • 8/16/2018 comfortable, high quality, very warm

    5 Review Stars By picky53year old

    This is a very warm shirt almost as warm as a wetsuit, although this is so much comfy softer!.. It fits snug, probably to keep you warm.. I am usually a large in tops and the XL was still very form fitting. So it's great if you want to be warm but this is not your usual long sleeve rash guard/swim shirt

    picky53year old
    Southern NJ

    Fit: Feels too small

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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.