Love this shirt! I live in Louisiana and this is the only shirt I've found that really helps keep me cool on those hot, muggy days that Louisiana is known for. Most performance polyester t-shirts become sticky and suffocating and just trap the heat in on hot still days. Cool Breeze does what it say's -- as hot air passes through the special cooling material it cools down so that it feels like a cool breeze against your skin!
a. The Cool Breeaze yarn is specially constructed in a flat shape to increase contact with the skin; it is also channelled or grooved to permanently move moisture from the skin, and is derived from elements which noticeably increases the cooling effect on the skin: these elements from which the yarn extruded, are designed to absorb and remove heat from the skin at a higher rate than other synthetic yarns. ( The yarns have a higher “thermal effusively" than usual synthetic yarns)
b. The difference between the cooling effect of a regular synthetic or natural yarn and the Cool Breeze is noticeable to the touch, when the fabric is dry: and this difference increases substantially when you sweat and when you are exposed to wind or your move from a static state to an active state. All of this is clearly exhibited in the new ASTM D 7984 test which rates Thermal Effusivity of any material. Thermal Effusivity is defined as the capacity of a material to conduct thermal energy. As an example, if you touch an object made of metal in a room at room temperature, it will feel much ‘colder’ to the touch, than a wood object in the same room at the same temperature. The higher the Theramal Effusivity co-efficient, the greater the capacity of the material to conduct thermal energy and the ‘cooler’ the effect.