The Caltech long-sleeve top has a quarter zip with contrast teeth allowing you to adjust your body temperature. The interior zipper flap protects you from the chill of the zipper against your skin. Sizes: XS - 3XL (3XL selected colours only). Features: Superior stretch and comfort, centre front zipper with contrast teeth and autolock zipper pull, Interior zipper flap, coverstitching on seams, heat transfer label for tagless comfort, dropped back hem. Packaging: Polybag. Materials: 87% Polyester 13% Spandex jersey knit. 222 g/m2 (6.6 oz/yd2).