Product details:

Amplify your warmth by adding a little layering with the ONeill Wetsuits Thermo-X Rash Guard. Soft, stretchy and odor resistant, the Thermo is a smart accessory for the savvy cold water surfer. Put the Thermo-X Crew on under your existing wetsuit to dabble into colder seasons or to extend an older suits life until a new one is on its way. A cold nipping layering piece that offers an additional shield of core warming protection, the ONeill Thermo-X Short Sleeve Crew gives incredible insulation with minimal bulk.Thermo-X layering fabrics provide incredible insulation with low bulk and quick-dry properties.
Maximum core insulation.
Water repellency, odor resistance.
4-Way Stretch fabric.
Boardshort Connector.
Rash Protection.
Strategic Seamless Paddle Zones.
Super Low Neck: No interference with wetsuit neck.