Race brief specifies a comfort rating of 0 so I would say is suitable as it is (no liner).
See https://en.wikipedia.org/wiki/EN_13537 for an explanation of the different ratings.
Hi Jilly, we sent an email out explaining we would accept the comfort limit for women as a basis, so a 300 or a 400 would be ok. However, we strongly recommend using the Comfort scale. As a guide, here's something that may make the decision making process easier. I hope it does at least, as sometimes when I try to simplify things - it makes it more difficult! [SBAGS](//muut.com/u/spine-race/s1/:spine-race:usJi:sbags.png.jpg)
Thanks I've lost the email!!!