First Layer® Silk Weight: at 100g/m² First Layer® Silk Weight is the lightest next-yo-skin, performance fabric available in the world. For active outdoor activities where moisture transferring and fast drying is a priority this fabric is ideal. It can be used as a technical summer weight T Shirt, actively evaporating perspiration into the air, or as a luxurious soft under layer actively transferring moisture to the next layer of clothing. First Layer® Silk Weight, despite its weight, is an effective sun protection layer – it has a UPF rating of 15. Sleek and very soft to touch, First Layer® Silk Weight uses the latest fibre technology to give the fabric a permanent Dry Fast® moisture transfer finish. This same treatment also gives the fibres a permanent anti-bacterial finish to ensure all body odours are removed during washing. First Layer® Silk Weight's compactness, fast wash and dry cycle and remarkable crease-free surface makes it perfect for adventure travellers.