Sublimation Polo Shirts UK Custom Polo Shirts. Valkout Apparel uses 100% polyester fabric at 140gsm and 160gsm for its sublimated custom polo shirts and sublimation polo shirts. The fabric that keeps moisture out and lets air flow through. We make custom logo polo shirts with a 1/4 zipper stand up collar, 1/4 zipper polo zipper collar, three buttons up, two buttons up, and full button down. We use the pantone color system and the CMYK color system to produce sublimation polo shirts and custom designed polo shirts. Also we can send you our company fabric color swatch for your references, you can pick the right color from it for your own sublimation polo shirts. We always follow a strict procedure to ensure that the color matches your requirements.