UHS-II Speed Class 3 Rated. The Sandisk SDXC 256GB Extreme Pro 300MB/s UHS-II U3 V90’s Video Speed Class rating, write speeds are guaranteed not to drop below 90 MB/s, allowing you capture uninterrupted, cinema-quality 4K, 3D, and Full HD video at a minimum sustained write speed of 90MB/s. It also enables improved continuous RAW shooters plenty of speed with minimum bottleneck.

Ultra-Fast Read/Write. When used with a UHS-II compatible camera, you’ll see read speeds up to 300MB/s and write speeds up to 260MB/s. The memory card is backwards-compatible with SDXC supported cameras, but you won’t see any increase in speed.

Durable Construction. This memory card is shockproof, X-ray proof, and waterproof, and has an operating temperature of -13° to 185°F. You can use it in the desert, in snow, or underwater. Even if your camera doesn’t survive, this card probably will.