ONeill Thermo-X 13oz Polylefin Short Sleeve Rash Guard 3660-XS 079764

Mfg Part #: 3660

ONeill Thermo-X 13oz Polylefin Short Sleeve Rash Guard

  • Lightweight polyolefin insulation
  • Odor resistant
  • Designed for thermal layering
  • For use as a thermal layer or UV protection
  • Can be worn by itself in warm water or under a wetsuit for added warmth
  • COLORS: Black
  • MENS SIZES: XSmall through 2XLarge

Customer Reviews for ONeill Thermo-X 13oz Polylefin Short Sleeve Rash Guard:

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Average Customer Review: based on 1 reviews.

Rating: ONeill Thermo-X 13oz Polylefin Short Sleeve Rash Guard Review - Scuba Gear Customer Reviews
Reviewer: Lori M.
I love this rash guard! Keeps me nice and toasty but dang...I sure wish it had a high neck like regular rash guards do.

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Questions and Answers for ONeill Thermo-X 13oz Polylefin Short Sleeve Rash Guard:

  • paul:

    thanks very much. i guess I forgot 2 more question: is it stretchable? is the material insulated with polar tech like stuff.

    Aaron  (Certified Scuba Instructor at

    It is stretchable to an extent. The outside is a lycra (rash guard) material and the inside is polylefin (fleece like) material.

    Darrick  (Certified Scuba Instructor at

    Hello Paul, this will be the same type material as the polar tech material and this will have some give to it, but is not made out of super-stretch like other material on the market.

  • paul:

    what would the jacket be in a neoprene mm? .5mm, 1mm, 1.5MM?? Is it neutrally bouyant??

    Darrick  (Certified Scuba Instructor at

    Hello Paul, you would be looking at 1.5mm and this would be a neutrally bouyant item.

  • Pieter:

    the picture shows a "high neck" , but a comment talks about a short neck. What is the truth ?

    Arthur  (Certified Scuba Instructor at

    Hello, the neck is an average rash guard size.

  • Christine:

    Im looking for a top to keep me warm in the local pool this winter. I was directed to a "ONeill Thermo-X 13oz Polylefin Short Sleeve Rash Guard" but I am a sm/med woman and I only see mens sizes. Is there something else that would work for me?

    Darrick  (Certified Scuba Instructor at

    Hello Christine, here is a long sleeve shirt that has both men and women sizes:

  • Jim:

    Do you have 2 medium size in stock?

    Arthur  (Certified Scuba Instructor at

    The Ask the Expert system is an ongoing product information database. For more information about alternate products or for more specific information on individual items (such as serial numbers or product availability) please contact our instructors at

  • Jim:

    I guess your answer to my question was "no" but it wasnt clear. If you do not have the short sleev rash guard in stock, do you have the long sleeve? Thank you.

    Bob  (Certified Scuba Instructor at

    As this is an ongoing product feature/benefit database, please contact our instructors at for answers regarding inventory and/or stock status.

  • Peter:

    Hello there. I am looking for a skin for under a 3 mill wet suit for added warmth. I am 6 ft tall, 44 inch chest , 34 inch waist 190 lbs. ONeill Thermo-X 13oz Polylefin Short Sleeve Rash Guard is the item I was looking at. Question, will it do what I want and what size would be good.

    Arthur  (Certified Scuba Instructor at

    you are a large.

  • key:

    OK, I know what to order. How do I determine what size ?

    Darrick  (Certified Scuba Instructor at

    Hell Key, when you are sizing an item like this the chest and height are the two most important measurements and would get the size you fit into.

Thermo-X S/S Crew

ONeills 220G Powerstretch P2 layering fabrics provide incredible insulation with low bulk and quick-dry properties. PolarTec Powerstretch  with DWR coating provides maximum insulation and water wicking properties.

Seamless Paddle Zones

An ergonomic, seamless undersleeve panel that allows for unrestricted motion and eliminate rashing.

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