Cauliflower

[MrBig46]

I am looking for varieties of cauliflower which, at the stage when they are not yet planting flowers, are able to survive our winter under non-woven foil or in a foil tunnel (in cold bed). Some will perhaps withstand such protected -15 ° C. I'm primarily concerned with the names of those varieties (I read that some are of Japanese provenance) and only then where to get the seeds.
Thank you in advance for any information.
Vladimír