I have been wearing the 8-ounce O'Neill Thermo L/S Crew for a year now. In the winter, spring and fall seasons it works great. It does not irritate my skin or make me itchy like some of the other reviews state.

Knowing it was a MUCH thicker rash guard with thermal layering, I bought one size bigger than what I wear in a regular rash guard. It fits like a glove and dries very fast after getting out of the water and my wetsuit. Anyone who surfs knows that you definitely don't want a loose thermo layer, it won't keep you insulated if it's loose. I do agree that they run a size smaller than what your normal clothing size is.

This year, I am upgrading to the O'Neill 13-ounce Thermo-X L/S Crew thanks to my friends bragging how warm they are in the winter water. The water has been in the mid to low 50's and the 8-ounce O'Neill Thermo-X L/S Crew has served me well. I usually am in the water for about 3 hours at a time, a few times a week.

You get what you pay for and this is a quality item that works very well.

I just bought the O'Niell 13-ounce L/S Thermo-X and it is like a warm sweater in the water! It dries almost immediately when you get out of the water. I actually started to sweat in my wetsuit when the sun came out! Thankfully it was a rainy day and the clouds, rain and large waves cooled me off a bit. The 13-ounce works VERY well in some very cold conditions. I highly recommend both products.