For our chamois fleece mid layers, we use a double-bed, knitted Merino grid fleece made from nylon and Merino. They can be worn as a stand-alone garment against the skin or paired with our base layers as added insulation when temperatures drop. The nylon provides protection against abrasion, while the inner Merino grid provides breathability and super-light insulation. This is the temperature control layer for your body's micro-climate.