Another cold wallet is the new Zero NGRAVE.

"The ZERO is the most secure hardware wallet ever made, and the corner stone of NGRAVE’s impenetrable security ecosystem. Conceptualised and built from scratch in close collaboration with world leading institutes in chip manufacturing, applied cryptography, and hardware security, the ZERO comes at an unparalleled level of inherent anti-tampering. The ZERO is completely offline, from secret key generation to transaction signing, keeping your holdings away from any online attack vector."