The best layer you can pack, for really any adventure, is a hardshell jacket. There are expectations, of course, but really only for those who live on the equator. A hardshell is a durable, waterproof ...

Expensive. Can't use the hand pockets with a climbing harness. Like most durable water repellents, it uses carcinogenic perfluorocarbons in the waterproofing process. When it comes to outdoor ...