Relevance. Rating Newest Oldest. Best Answer: It depends on what type of extensions you have both brand and method. If you have cheap synthetic hair extensions then it is best not to get them wet unless you purposely put the extensions in for the trip and plan on taking them out when you get back home.If you have good quality 100% human hair extensions then yes you can get them wet.If the human hair isn't a good quality your hair will be a mess. If you are sewing your extensions in then yes you should be able to swim with them unless your hair type is like Caucasian hair.elevance. Rating Newest Oldest. Best Answer: It depends on what type of extensions you have both brand and method. If you have cheap synthetic hair extensions then it is best not to get them wet unless you purposely put the extensions in for the trip and plan on taking them out when you get back home.