According to the Phoenix’ website:
The yellow and black match kit was designed by adidas in collaboration with the club. The thick vertical stripes that have characterised the team’s uniform for the past few years have been channeled into the torso of the jersey. These thick stripes are dear to the heart of the Phoenix, and were originally drawn from those within the team’s crest.
The thick stripes are accented by adidas’s signature triple stripe, which runs across the shoulders and down the sleeves…
The strip contains Formotion and Climacool technology, to allow players freedom of movement while keeping them dry, cool and comfortable. For the first time, players can choose between short-sleeved and long-sleeved shirts.