As your exercise intensifies, you start to produce more sweat, which the shirt will then react with. Sweat is absorbed by the material, removing it from the skin where it then will be wicked away by the material. In addition to this, the material allows air to flow in and out of the singlet easily. This means that the hot air trapped against the skin is able to find a way out through the fabric, which will then be replaced by cooler air from outside. This will make sure that the skin, and ultimately the body wont overheat. The relaxed fit of the singlet will mean that it will fit in a non-restrictive and flattering style whilst the sleeveless cut ensures you have full, unrestricted mobility for upper-body exercises. The flat-lock seams reduce the risk of rubbing and chafing by sitting gently against the body. With reflective elements, this will ensure that you will be easily spotted during night time and in low-light, making it safer.