North Ridge Resistance Baselayers are made using marled polyester knit fabric, so they\'re very comfy and light and dry quickly when they get wet. Their minimal flatlock seams mean there is little friction or rubbing when you wear them next to your skin and under your other layers, while the stretchy mesh side panels promote breathability so you stay dry and comfortable. Active odour control in the fabric, using an inbuilt anti-bacterial treatment, keeps them feeling fresher for longer - especially useful on multi-day expeditions!Main: 100% Polyester Mesh panels: 88% Polyester and 12% Elastane