Every cyclist should own a quality, ultra-light weight, packable jacket and the Pearl Izumi P.R.O. Barrier Lite jacket is one of the best. P.R.O. Barrier Lite fabric provides lightweight wind protection, water resistance and is surprisingly warm for such a thin material. It is so packable that we have heard some cyclists store this jacket in an inner tube box to neatly carry in their jersey pockets.
It is great to wear on chilly mornings and can be easily packed and stashed in a jersey pocket when the temperature rises or pace quickens. Riders in the high country don't leave home without this jacket. Elasticized hem and cuffs along with a form fit will keep you riding speed high.