The WOOM tri top is a great choice due to its lightweight and comfy characteristics. These are due to an intelligent combination of of three high tech fabrics. First, on the front panel is the Power Skin fabric that is known for being extremely light, comfy and provides optimal thermal control. Second, the vertical panels are made from Power Flex fabric that provides perfect muscle compression and helps athletes maintain good posture during exercise. Finally, the Power Mesh fabric found on both the back and shoulder panels has special wicking capabilities ensuring optimal ventilation and thermal control. Additionally, the top has two large back pockets perfect for carrying nutrition during races and training.