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O'Neill Guys' Thermo S/S Crew Rashguard 8oz

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Product Rating   Product Rating  8 customer reviews|43% say true to size
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SKU: 0003
Product Code: 11901

Availability: Usually ships within 24 Hours
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The Thermo Series from O'Neill is scientifically designed to insulate and perform in practically any situation.

• Short sleeve
• 8 oz.
• Seamless paddle zones
• Board short connector
• Maximum core insulation
• Water repellency, odor resistance
• 4 way stretch fabric
• Rash protection
• Flatloc stitched- a breathable, overlapping flat stitched seam, non-chafing and super durable; made for warmer conditions
• Strategic seamless paddle zones- an ergonomic, seamless undersleeve panel that allows for unrestricted motion and eliminates rashing
• Super low crew neck so there's no interference with wetsuit neck
• P2 Technology features polypropelene which provides excellent insulation in minimal bulk fabric
• Imported

Also seen in:

Beach Shop
Surf Shop


  • 4 star rating (8 Reviews)

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  • rating star
    By from
    on 11/7/2011
    Feels too big

    when i started looking for this, i did not know just what to get.  i wanted a specific thing, not a wetsuit.  i wanted something two-piece.  since i already had my insotherm bottoms, all i needed was the top.  i settled on the O'NEILThermo Rashguard, basically out of lack of options but it has worked out well.  the biggger size gives me better range of motion in the water when i do my workout too.

  • rating star
    By from
    on 4/5/2011
    Feels too small

    Pros: Warm and light, fits well through shoulders, great for swimming, no buoyancy.
    Cons: Too short in torso.

    I wanted a shirt to wear swimming when the lake is a bit cold. This provides a decent amount of warmth, more than an ordinary lycra rashguard. I wanted a rashguard like this over one with neoprene because I didn't want any buoyancy -- wanted to feel the same in the water as not wearing one, which it is.

    Great freedom in the shoulders for swimming. The neck is actually pretty high, but not so high to be uncomfortable. Sometimes I forget I'm wearing it.

    A medium fits me skin-tight, and I can just barely get it on and off, but this is just what I wanted for swimming. My chest is 40", waist 35", height 5'11"; it wouldn't fit anyone bigger than me.

    The one downside to this shirt is its length (and why I'm only giving it 4 stars and not 5). It is short in the torso. It could use another 2-3 inches of length. It barely covers my bellybutton. I would definitely not recommend it for anyone taller than me.

  • rating star
    By from
    on 10/2/2010

    when i first got this i thought it was way too small, i could barely get it on but since i had nothing else, i figured i'd try it.  once in the water, it practically disappears, no discomfort at all.  well, ok, maybe the neck was still a teeny bit snug, but not too distracting.  everything about it was better than the body glove rash guards i used before.  it's much warmer, even though it's short sleeve.  also, love the black on black.  will definitely be buying the l/s version for winter.  (indoor pool lap swim)

  • rating star
    By from
    on 5/29/2010
    Feels too small

    Chest, Neck and arms fits awesome. But I always find myself pulling down the waist of the shirt.

  • rating star
    By from
    on 2/8/2010
    Feels true to size

    Nice & light. Easy to get on & off. Just enough insulation for Maui and good sunprotection. Easy to clean. Fit me true to size for an XL.

  • rating star
    By from
    on 10/24/2009
    Feels true to size

    Great product. Good quality. Very pleased. Would highly recommend.

  • rating star
    By from
    on 10/6/2009
    Feels too small

    i felt sure ordering a xxl would be plenty big for my 13 yr old..i was very surprised when it arrived. it should be labeled a medium and its short in the torso..i had to return it...

  • rating star
    By from
    on 3/10/2009
    Feels true to size

    Fits well and kept me warm swimming in a YMCA pool in winter.



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.