My suggestion is either the multi-flange ones joined with a neck cord or possibly the 3M closed cell foam ones with the plastic skeleton attachment for the cord.
At a more general level, here is part of what I said to a similar query on another site:
.. The two problems with plugs is that firstly, many users simply don't insert them properly/deeply enough. It amuses me to see shooters with 2/3 of a closed cell foam sticking out into their concha (ear bowl). You can stake your life on the plug giving very little protection if you see this. In the case of custom-moulded plugs, the quality of the ear impression and post-impression processing can easily be poor, and you'll end up with a leaky plug. I've seen many "instant plugs" made at shows/ events/ fairs that are just plain pathetic in execution. Some I saw were downright scary- spotted a pair curing where the impression material had skirted the too-small cotton dam and had actually been pressing on the drum. This is one small step from disaster. The other risk is people who don't know what they're doing injecting down canals where they haven't the knowledge or illumination gear to see what's down there. Some people have badly necked canals which increase markedly in diameter further down. End result is a trapped impression that can't be removed other than by a surgeon under GA, and believe me, the surgeon won't thank you for being called in for that.
If you're in the market for custom plugs, either passive or electronic, please make sure you get someone with proper training and extensive experience to take the impressions. The end product is only as good as the impression, and you don't want your ear written off by an "accident" during impression taking. ..
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6x47
(Retired clinical audiologist)
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