A medium-weight short-sleeve base layer tuned to keep your core lightly insulated & dry in cool conditions. This protective layer sets the foundation of our ASSOS Layering System doing the job of keeping your upper half lightly insulated & dry in the cool challenging conditions of spring & fall. Having been tested over & over again by our product team until we were finally satisfied the Spring/ Fall SS Skin Layer represents a total first-layer reset. 71%PP 22%PA 4%EA 3%CF