Superlight and packable, the men’s ZETA SL jacket by Arc’teryx is designed to be carried with ease for unexpected downpours. Since summer hikes often entail unpredictable weather, this emergency GORE-TEX shell is waterproof and features a StormHood and WaterTight zips to keep the elements out. The Zeta offers great freedom of movement to keep on trekking no matter the weather.