Kingston 64GB SDXC, rated UHS-i U3 V30, rated for 200mb/sec sequential transfer — fast enough for continuous 4K/high-resolution video capture, not just photo storage. Built water/temperature/shock/vibration/X-ray-resistant, suited to action cameras and field use where a card can get dropped, soaked, or left in the sun. Sold as a retail-packaged card with the manufacturer's lifetime warranty.