Soft Silicone: This mobile cover for Vivo X21 is available in soft silicone material. This type of cover is UV printed in HD Quality with the best quality inks. This makes cover look very vibrant.\n\nThe silicone mobile cover for Vivo X21 is partially printed on the sides. You can even offer this cover as part printed and part transparent. Just change the opacity of the background layer to zero to make the base transparent.