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The underside is a specially made non-slip material
.
 

The quick release cord locks make it easy to secure or remove your
saddle pad in seconds.The elastic cord is only 1/8" thick and able to
fit under the saddle between the saddle bottom and frame of your bike.
These same cordlocks hold your cord in place while cushion is not on saddle.

In photo above, this cordlock should be snugged up
to the bottom edge of saddle to keep cord firmly in place
while cushion is not in use.