Those are triple stiched hard sponge. It is basically 4 layers woven together. They are not hard plastic which will give you a comfortable ride in both cold and warm weather as it wicks sweat away and for us guys thats important.
"Bikes don't kill bikers...cars do"and your ass looks fine
-If you can't do 200 or better, dont bother me
-pres. of THE KRU