When the sun is on your back, play in a top that has your back. The Wilson Wilson All Day Half Zip uses soft, UPF-protective fabric with sweat-wicking, quick-drying performance. It has a slim fit that hits higher up the hip and a shaped collar that rises higher up the back neck. The half-zip neckline lets you adjust airflow and pulls on and off with ease. Ergonomic sleeves with bonded thumbholes eliminate underarm discomfort and keep the sleeves from slipping during play.