spooky,
if you look under the padding or even the skip you can see the fibreglass and they sure smell like fibreglass and resin when new unless i have got a one off one.
abs plastic is smooth both sides check a skate helmet or any other abs helmet the plastic is smooth on both sides whereelse a fibre/composite one is smooth on the outside and the inside you can see the fibres/resin..
i too was amazed to see that mines are not plastic but fibreglass/composite construction..