The Ozone Thermal Rash Vest is an incredibly warm rash vest with a Lycra outer and a micro fleece inner to trap water and keep you amazingly warm. This vest is much warmer than a titanium skin rashie from other brands when worn under a wetsuit.
We wear them under our wetsuits in winter to keep incredibly warm, despite cold winds and even colder water.
In warmer times just wear it and a board short and you'll be warm and look good. It breathes in the sun so can be worn on the beach without sweating.