The Pertex 6 shelland Tecmax microfibre lining of this shirt provides the best in comfort and performance for the serious user who needs and demands it. Intended primarily for professional use and ideal for instructors who have to spend time stationary, the Tecmax is suitable for trekking and winter hill walking when conditions demand extra insulation (it's generally a bit too warm for low level walking). The densely woven micropile provides very high insulation whilst maintaining superb wicking properties. This superb performance is partly due to the 'Tecmax' Pile which has a dense construction of ultra fine acrylic microfibres, but is unique in the fact that the filaments of the pile are polar; water molecules are also polar, so are pulled through the fabric to the outer surface, keeping you warm and dry inside.Please note that some items from Buffalo are made to order. Our delivery estimate for these items is currently 35 to 40 working days but during busy periods it may take a little longer for items to reach you.