jockey.co.zaは安全ですか？

So long as the site is https://www.jockey.co.za or https://jockey.co.za and is using a commercial CA HTTPS certificate you can expect the site to be legitimate as that domain name has been renewed/registered every year for the past 25+ years. Any misspelling of the jockey.co.za above will not be valid. Listed contact telephone numbers are answered by real humans and support emails exist on the website which can be checked before purchasing if you wish, and you can find on the website locations and phone numbers of physical Jockey retail shop locations across SA if you prefer. I have bought from the website and retail shops myself a couple times already without any issues.