Comfy Fabric: 100% polyester.The fabric is thin and lightweight with stretch, fast drying, breathable and comfort, can meet the basic needs of exercises. If like the loose fit style, pls oeder size up. Zipper closure Zippered Side Pockets: Two pockets are convenient for keys, phones, and other personal items to store secure when doing sports. Thumb Holes: Regular fit sports jackets is close to the body, offering a semi-fitted feel.Design with thumb holes provide hand coverage and warmth during the chilly seasons. Perfect Activewear for running, jogging, exercise, yoga, fitness, gym, hiking, cycling and any type of workout or everyday use.