Amika Flash Instant Shine Hair Gloss Mask Intense Moisture 60 ml/2 Fl Oz. New. Fast Shipping. Immediately deliver intense moisture and shine with this “flash” acting treatment mask. No need to use a conditioner - this post-shampoo, rinse-out formula visibly smooths and leaves hair with a silky finish in just 60 seconds. Gives brilliant shine, softens and hydrates hair in just 60 seconds. Post-shampooing, apply product in sections until hair is fully saturated. Wait at least one minute. Rinse.