From Warm-Up To Cool Down. With An Airy Back Vent And Convertible Sleeves You Can Zip On Or Off, This Transformable Windbreaker Keeps Your Workout In The Comfort Zone. Designed For Training. Relaxed Fit Feels Roomy And Can Be Worn Over Larger Layers. Size Down If You Prefer A Slimmer Fit. Zippered Hand Pockets With Hidden Phone Sleeve, Hood Cinches At The Back To Maintain Peripheral Visibility, No-Bounce Loop Keeps Your Hood In Place, Back Vent Strategically Placed To Provide Airflow, Zip Off The Sleeves To Convert From Jacket To Vest.