1. HIND P.E. SHORT SLEEVE SHIRT » This T's grid pattern minimizes points of contact on the skin for increased airflow, which helps keep you cool. And on long runs, the extra-stretchy underarm panels don't chafe. $38; hind.com

2. ADIDAS SUPERNOVA RUNNING SKORT » The best part about running in this high-performance skirt—besides no chafing—is the low-pressure elastic waist that allows easy breathing. $42; shopadidas.com

3. PATAGONIA NINE TRAILS VEST » The contoured fit, drop back, and stash pocket make this featherweight a go-to piece for cool weather. The shoulders and front are water-resistant, while the back is cut from more breathable stuff. $75; patagonia.com

4. BROOKS HVAC SHORT » You shouldn't have to think about your running shorts. And because the HVACs have a stride-friendly, shorter-in-the-front, longer-in-the-back inseam and moisture-wicking liners, you won't. $44; brooksrunning.com

5. SUGOI SWIFT TANK » Three reasons we love this tank: The lightweight, quick-drying fabric drapes loosely around your torso, an independent shelf bra provides support, and the open-mesh, tank-style back breathes well. $35; sugoi.com

6. PEARL IZUMI WOMEN'S ULTRA-LITE VISOR » With a narrower-than-unisex headband and a flower logo that's cute—not gratuitous—this adjustable sun shield kills the squint with style. $20; pearlizumi.com