The Radiation Undersuit uses 300 gram anti-pilling Quick Dry fleece to provide superior warmth and insulation beneath the drysuit outer later. A superb quality thermal base layer garment to wear under your drysuit which will help enhance the performance of any breathable drysuit. Made from high-tech lightweight fleece material, it traps body warmth but also breathes to allow moisture to evaporate.

The breathability of any drysuit will be improved by wearing the correct breathable base layers and the Gul Thermal Radiation undersuit works in conjunction with your drysuit.  By allowing for layers to be worn underneath the Gul Undersuit is necessarily roomy which also helps freedom of movement particularly for more active sailors.  These thermal 'onesies' have more recently also become extremely popular as a thermal layer to put on after open water/wild swimming.