Thermo-X layering fabrics provide incredible insulation with low bulk and quick-dry properties. Features: Maximum Base-Layer thermal insulation 4-Way Stretch Fabric Water Repellency Rash Protection Strategic Seam Placement Super Low Neck: No Interference with Wetsuit Neck Boardshort Connector 220g Nylon/Spandex with HyperDry for maximum insulation and minimal water absorption Thermo-X HyperDry Flatlock Stitched Breathable Seams