The layer that you put on first and take off last - Merino wool is ideal when it is in contact with the skin, it is extremely soft, breathable and durable. Merino Air-Con fabric (fibres are stronger while maintaining the same functional properties) is ultra-lightweight and suitable for year-round wear - it doesn't scratch, wicks sweat, keeps optimal temperature and doesn't smell. The panties have a double layer on the inside of the leg for comfort and the typical wide "waistband" with the Mons Royale logo.