It is specially designed for sports such as running, cross - country, marathons, and training. Made of high - tech quick - drying polyester fiber fabric, the I - shaped pattern is more breathable. The wind - tunnel design all over the body accelerates sweat evaporation, quickly dissipating heat and cooling down. With an ultra - light weight of about 32g, it provides a burden - free sports experience. The four - way stretch combined with seamless pressure glue achieves a "zero" - sense fit, allowing for unrestricted movement.