Neoprin is a "spacer" material that has a similar look to neoprene and is a cheap alternative- however neoprin and neoprene are two very different materials. While neoprene is essentially black rubber backed by a layer of fabric on each side, neoprin's core is made up of many many tiny fibers that hold the two sides together.
This fragile "core" of the fabric allows it to stretch great amounts. However it lacks elasticity. Once stretched it does not return to it's original shape well, and instead it distorts easily. Many find that tails made from neoprin stretch too much for it to fit them properly, especially in the water- even after only one use. It will continue to stretch as it is worn, and a tail made from this material may require multiple size adjustments (taking it in). Also the fabric is very impressionable, making for permanent wrinkles, creases, and impressions from wear and other regular use (such as storing the tail).
Another downside to this material, is that becuase the water penetrates the core it can take much longer to dry. This is especially a problem when combined with tin cure latex, as the latex is damaged by the water.
Neoprin is a cheaper alternative, but it is also a much lower quality option.
It is HIGHLY recommended that you not use or buy a tail made of neoprin. Invest a little more money and instead get neoprene- it is well worth it and will save you trouble down the road, as well as making for a much longer tail life.
You can find a thread with photos and a video on neoprin and neoprene
here.
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