The microguard maxloft qmc synthetic insulation that can easily handle moisture and actively expels it to the outside ndash a clear advantage when you start sweating on steep uphill trails you feel dry and warm throughout the day from start to finish stretch fleece inserts at the sides ensure excellent mobility when using trekking poles and when it starts to rain just slip a hardshell on over the top using the snap in system to secure it and yoursquore off again with the icy tundr