O'Neill Women's Thermo-X Long Sleeve Insulating Rashguard
O'Neill Women's Thermo-X Long Sleeve Insulating Rashguard
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4.5(183)Rated 4.5 out of 5 stars

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

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    Product Details

    SKU: 5025 | Product Code: 8161304
    |
    Layer up for the coldest waves in the O'Neill Women's Thermo-X Long Sleeve UPF 50+ Thermal Rashguard. Featuring Thermo-X Hyperdry fabric that provides maximum...
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    Reviews & Questions

    4.5
    Rated 4.5 out of 5 stars
    Based on 183 reviews
    88%would recommend these products
    Fit/SizingRated -0.4 on a scale of minus 2 to 2
    Customers say
    Customers say this thermal rashguard keeps them remarkably warm in cold water and pools, with many swim instructors and regular swimmers praising its effectiveness during extended water activities. The fuzzy, fleece-like interior feels soft and comfortable against the skin, while the snug fit allows for unrestricted swimming movements. Users appreciate that it dries quickly and provides warmth both in and out of the water. However, many note the sizing runs very small, with most recommending ordering one size up from usual. Some find the tight fit challenging when removing the wet garment. Despite sizing concerns, swimmers consistently report staying warmer longer in cold conditions, making winter swimming and water aerobics more enjoyable.
    Customers talked about
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    183 reviews
    • LA
      Lucinda A.
      Verified Buyer
      Reviewing
      O'Neill Women's Thermo-X Long Sleeve Insulating Rashguard
      I recommend this product
      Primary Activity Uses Paddle Sports
      Rated 5 out of 5 stars
      10/10/26
      tight fit keeps the cold out

      Using it for shoulder season kayaking when a wet suit is too much; the medium fits like a small for me -- 5'4" 128 pds

      Fit/SizingRated -2.0 on a scale of minus 2 to 2
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    • ME
      Maureen E.
      Verified Buyer
      Reviewing
      O'Neill Women's Thermo-X Long Sleeve Insulating Rashguard
      I recommend this product
      Primary Activity Uses Swimming
      Body Type Slim
      Rated 5 out of 5 stars
      10/8/26
      Game Changer

      I swim laps in a pool that aims at 80 degrees. Having recently lost weight, I found lap swimming challenging due to cold intolerance; unable to endure more than 10 laps.

      This week I wore the swim shirt and neoprene shorts and swam 33 laps almost effortlessly-no longer fighting the temperature.

      Today I swam 25 labs and could have continued but had a time crunch.

      The shirt is fantastic. Full arm movement. My chest and torso were quite comfortable. The arms were less insulated and I could feel the coolness but it didn’t bother me.

      Very happy customer.

      Fit/SizingRated 0.0 on a scale of minus 2 to 2
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      S Profile picture for SwimOutlet
      SwimOutlet
      10/8/26

      Thanks so much Maureen! We're thrilled the Thermo-X rashguard helped you get back in the pool and swim with confidence. So glad it's working great for you!

    • NC
      Norresa C.
      Verified Buyer
      Reviewing
      O'Neill Women's Thermo-X Long Sleeve Insulating Rashguard
      I recommend this product
      Primary Activity Uses Swimming
      Body Type Slim
      Rated 5 out of 5 stars
      8/14/26
      Swimming pool

      Great to use for warming up in the pool. This is my 2nd one.

      Fit/SizingRated 0.0 on a scale of minus 2 to 2
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      S Profile picture for SwimOutlet
      SwimOutlet
      8/14/26

      Thanks so much Norresa! We're thrilled you love it enough to come back for a second one!

    • JM
      Julia M.
      Verified Buyer
      Reviewing
      O'Neill Women's Thermo-X Long Sleeve Insulating Rashguard
      I recommend this product
      Primary Activity Uses Surf
      Body Type Athletic
      Rated 5 out of 5 stars
      8/9/26
      Fights snug

      Perfect fit. I’m 5’5” and 134 and very fit. Strong arms and shoulders. The small fits perfect. Can’t speak to how well it works bc it’s not chilly season yet.

      Fit/SizingRated 0.0 on a scale of minus 2 to 2
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      S Profile picture for SwimOutlet
      SwimOutlet
      8/10/26

      Thanks Julia! Glad the small fits you perfectly. Looking forward to hearing how it performs when the chilly season arrives!

    • MY
      Meghan Y.
      Verified Buyer
      Reviewing
      O'Neill Women's Thermo-X Long Sleeve Insulating Rashguard
      I recommend this product
      Primary Activity Uses Swimming
      Body Type Athletic
      Rated 5 out of 5 stars
      8/2/26
      Sized up

      I ordered a medium and a large when reading reviews about sizing up. Large is comfortable but not loose. I haven't yet worn to the water.

      Fit/SizingRated -1.0 on a scale of minus 2 to 2
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      S Profile picture for SwimOutlet
      SwimOutlet
      8/2/26

      Thanks for the feedback, Meghan! Glad the large fits you comfortably. Hope you love it in the water!