Why is our Euro cap better than a traditional cotton cap? The sublimation process requires a polyester-based fabric, and that’s why our cap is not cotton. Cotton caps require the artwork to be screened and not sublimated. The problem with screen printing is that you can’t use intricate designs like fades and tone-on-tone printing. Another problem with screened logos is that, like T-shirts, the logos will eventually crack, peel and fade over time. If you’ve ever washed a cotton cycling cap, you know exactly what we're talking about.