Useful for hobbyists, but not for ears!
The idea sounds good but stick to Mack's earplugs!<br />I use flanged earplugs all the time when working with my power tools / guns and when this new-to-market product appeared in my Amazon Vine Reviewer list, I was able to order it at no cost to me in exchange for an honest and detailed review.  It seemed like I could get that professional, customized earplug fit at a really low price.  Nice!<br />Since everyone's ears are different, the concept of a moldable silicone plug seems ideal.  The advertised noise reduction is reasonable at 20dB (ANSI), though not the best you can get compared with dedicated plugs, like the flanged Mack's at 26dB (noting that +3dB represents a doubling of noise, or in this case reduction).<br />The material is like putty.  You can roll it in your hands to warm it up and shape it.  Pull it and it tears apart.<br />  You can remold it into one again with some more finger/hand work.<br />I followed the instructions and simply pressed a ball of the putty into my ear over the ear canal opening.  There was some noise reduction, but I needed to work it a little more.  While it molded to my ear, it didn't feel well-secured.  I did some head shaking, jaw clenching and bending down and I felt it come away slightly at the rear.  I decided to reduce the size of the ball and took the putty out, pulled a piece off, re-rolled it and pressed it back into place.  It seemed to feel a little better.  I tried working outside with the earplugs in place and it didn't take long for the heat and sweat to loosen the grip.  I seemed to be constantly pressing the material back in place, which isn't practical with fingers covered in soil or grease or with gloves.  With gloves, I found deposits of the putty were left on the glove fabric.  I wouldn't be keen on using a plug more than once as it'll contain all sorts of junk I wouldn't want in my ears.<br />I'll be sticking with my better performing and retained flanged ear plugs, which I can rinse off, thank you very much!<br />I can see someone using these indoors, like the photos in the description shows; for sleeping (though they might leave stuff on your pillows!) or ignoring the noisy kids!  Not so sure about swimming, but maybe?  These are not for use outside IMHO or where you need positive retention.  As a DIY'er, I actually see some other uses, like temporary hole plugging or cleaning debris off things as these are akin to an automotive clay bar!  I wouldn't recommend them to anyone though, based on my experience, but you can try them for yourself, since they are actually only $7 for, I think, 16 plugs.
Rating: 1 stars