Thermolite provides warmth & comfort without weight, even when wet. Its the lightweight fabric that provides heavy-duty performance because its fabric made with ADVANSA engineered hollow-core fibres that trap air for greater insulation. Plus, wearers stay drier because it dries 20% faster than other insulating fabrics, and 50% faster than cotton. Thermolite is the perfect layering fabric because its comfortable & lightweight, allowing more freedom of movement.