Title: +038=627.001-##001T_03-Fasadevasksystem NorAcon - International Code of Practice (ICOP).pdf
O.3.6.1.3.1 Next to the base layer is the mid layer. The objective of the mid layer is to trap as much warm air as possible between it and the base layer. Mid layers are usually thicker than base layers and are often made from a fleece fabric but they can also be in other forms, e.g. a woollen sweater; a lightweight duvet jacket filled with either man-made materials or natural down. In very cold conditions, two mid layers may be worn, e.g. a fleece next to the base layer and then a duvet jacket on top of this. Mid layers made from cotton should be avoided because cotton does not dry quickly and does not provide good insulation.O.3.6.1.3.2 Mid layers should have good wicking attributes and should be worn with a looser fit than a base layer, so that they allow freedom of movement, but not so loose that the air between the layers (which provides insulation) can escape easily.