Your submitted image must match the Imprint Dimensions exactly (Width x Height in pixels) for each specified product.
Center images in the logo area
The pink boxes on the templates show where to position your art/logo to ensure they will be centered.
Keep important assets inside the safe area
Safe areas are generally within 1/8 of an inch from each edge. Important graphics and text should be inside the safe area (marked with the red line in the template) or they could get cut off. Background color or art can extend to the edges.