There is different sizes.I've had the saltwater(white) ones over two years.I'm 6'1'',250 and would recommend them.At first thought I should of bought the smaller sized seat but now that I'm used to the big ones am happy with them.Cool in hot weather,dry quickly after a shower ,and more comfortable than any vinyl seat.The straps adjust your back angle and are great.The only snag is the seat straps can twist in the breeze going down the highway if you don't shorten them so I do.Try em,you'll like em ....