This stripped down, minimal waterproof jacket from OMM is made from Kamleika fabric, a super stretch fabric combined with stretch seams and minimal seam construction that allows the jacket to move with you; providing the comfort of a baselayer and the performance of a fully featured mountain shell. The fabric fits close to the body to minimise fabric noise and flapping and make for a more comfortable wet run Kamleika Waterproof Jacket - Men's