I use these for swim practice and the fabric is grat because it won't weear down from the clorine. The under lining is just what I needed feels very comfortable.

Dont like the liner for underware,  feels to good but fits to big.  Great for a drag suit.

These Polyester PBT suits are much more durable than the Nylon/Lycra suits.  I was shocked when my Nylon/Lycra suits were losing all their color and getting all stretched-out in less than a month of swimming laps.  I took the suits back to the local swim store and they said "this is normal ... nylon wears out in about 4 to 6 weeks".   I couldn't believe this because I grew up wearing Speedos for about 12 yrs back in the 70s and 80s, and those suits were indestructible.  But, when two of them starting falling apart in rapid fashion, I tried this PBT fabric and it is so much stronger.  The color remains the same and the fabric is still nice and tight, whearas the Nylon/Lycra fabric lost it's tightness quickly and the chlorine was literally eating away the fabric.  You could see right thru the backside of the suit, so I had to wear another suit under my Speedo Jammers.   The chlorine does not seem to faze the PBT fabric at all.