The best in British sportswear unites with the leaders in sports and active nutrition to bring you this exclusive Bulk™ × Castore Quarter Zip Top. It’s time to train like a pro. Wear up close and personal or layer to your liking. Super lightweight, see it as your second skin. Designed to perform beyond expectations. Complete comfort. Faultless freedom of movement. Lighten up your training and let this winning entry work with you. All our clothing is unisex.