... Certificate 5) AZO Free and low Cadmium, Earth-friendly Product 6) OEM Accepted; Customer's Logos or special designs are Welcome ... twill, cotton BIO-washed cotton, Azo-free material pigment dyed, Canvas, Polyester, Acrylic etc4.ColorNavyMany colors for your choice.Standard color ... sample, Alsowe can design on the cap for your request.6.Back closureVelcro tapeBrass, Plastic, Velcro, Buckle, etc.Any kind ...