Introducing nano flex xtra dry fabric. Eight years have passed since castelli pioneered nanotechnology coatings in cycling clothing to provide a higher level of water protection without sacrificing breathability or stretch. They never stopped working on improving the fabric, and after numerous small improvements they are ready with the first major update the base fabric is a tighter knit double layer construction, and the water repellency treatment is improved to offer even more protection. The castelli nano flex pro 2 represents a significant improvement in making your foul weather riding much more comfortable. This will also be your go to tight for dry conditions. Its a no compromise piece for all your cool weather riding. Its not just about the fabric, though. This is a serious training tight, so it gets our progetto x airseat pad. For total protection in the high splash area of the inner leg, castelli use a fully reflective waterproof fabric that adds a high degree of night time safety to this tight. The tight is constructed with the bare minimum of seaming, which helps keep the rain out and makes it more comfortable. Always pushing for better castelli state that this is the best all around tight that we know how to make with todays technology, but were still working to make it obsolete as soon as possible.