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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 (44 Reviews)

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  • 5/17/2021 Awesome

    5 Review Stars By Lakeswimmer

    Kept me super warm swimming in a 50 degree lake. Runs a bit small.

    Chicago, IL

  • 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

  • 5/1/2021 great shirt for cool water

    5 Review Stars By Dale Allen

    just what  i wanted.  have ordered this before

    Dale Allen
    St. Augustine Fl.

    Fit: Feels true to size

  • 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

  • 4/8/2021 Not helpful in the pool

    2 Review Stars By Karen Weatherby

    I thought it would help in a cold pool, but it didn't. Probably best for outside only.

    Karen Weatherby
    Broomfiled, CO

    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

  • 4/7/2021 Warmest swim shirt of all!

    5 Review Stars By Deborah

    I swim a mile everyday and love getting to wear this shirt on not so warm water days.
    I truly keeps me warm.

    McAllen, TX

    Fit: Feels true to size

  • 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

  • 4/1/2021 Should fit very snug to work correctly

    5 Review Stars By Megumi

    I wasn’t sure on the size, but followed the sizing measurements provided. My suggestion would be not to size up or down.  These are a thermal layer and meant to fit snug like a second skin. It was tight but not constrictive when I tried it on once I received it - I moved my arms as I would if swimming and it didn’t seem to chafe or rub inordinately on the underarm or pull excessively while raise my arms. It was very snug around my torso and even around my arms, but again it didn’t pinch or constrict so I decided to keep it and use it. Glad I did. It works perfectly.  I swam 30 laps for the first swim session of the year, and while the water was warmer [OPENBRK]84°F[CLOSEBRK] than usual it was still chilly in the air [OPENBRK]69°F[CLOSEBRK] and I chill upon getting in the water most days before July. I didn’t at all with this in, and I didn’t even wear my thermal leggings. This stayed down on my abdomen with no riding up, water didn’t bubble between this shirt and my swim suit, and while I was swimming, my arms hand full free range of motion and there was no riding up, or rubbing while I swam. In fact, this felt like I had nothing on - except for the lack of shivering during my swim and after.  If you get the proper size based off the measurements it will feel very snug but not pinch. It should feel like a compression shirt. It does have boardshort loops to attach to other swim wear to keep it from riding up but for laps I had no issue.

    Tampa, FL

  • 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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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.