Ronhill Lady Trail Half Zip Short Sleeve Running T-Shirt Vapourlite Fabric - This offers a lightweight feeling and breathability in the garment with a premium quality wicking treatment. Flat-Locked Seams - Provides additional comfort and helps to prevent the risk of chafing. Reversed Back Zip Security Pocket - Enables you to store essential valuables such as an mp3 player safely and securely. Powermesh Stretch Pockets - Ideal for easy-access storage of items such as gloves and hats. Front Half-Zip with Lock-Down Puller - Increases air flow and ventilation when you overheat by pulling down the zip.