Romex 10/2 Cryo?

There is a couple of vendors selling Romex cryo.....How do I know that the cable was really cryo?

On the same there a better Cryo? Or all Cryo are equal?
If you deal with a known manufacturer you know that the item has been cryogenically treated.
No all Cryo is not the same and if you Google it many articles have been written to explain the difference.
I've used the following site many times and most highly recommend this company to you. On the website you can read explanations and or email or phone the owner for explanations. Alan is a very knowledgeable friendly person.