Weighing in at under four ounces, the Rab Men’s Phantom Pull-On offers lightweight weather protection in a tiny package. This stretchy waterproof pullover jacket packs down small enough to keep in your pocket or running vest so you’ll never be caught without it. The elasticated hood, cuffs, and hem stay put when you’re on the move, and the half-length front zipper offers easy ventilation when things heat up.