Whether you're looking for sun protection on a hot summer day or a comfy baselayer for the winter months, the Kühl AirKühl Hoody has you covered. Its fabric is designed like a window shade, with alternating bands of perforated material for ventilation and tightly-woven fibers for blocking out sunlight. Its hood fits comfortably over or under a climbing helmet and the sleeves have convenient thumb loops to prevent bunching when adjusting layers. This is a shirt I'd take on any outing, no matter what season. kuhl.com; $75.