Bedrail for a cotbed???

[MayMom]

I'm looking for a bedrail for my DD's cotbed. She can climb out so I think it's time to convert from a cot - should I try her without a rail first?

All of the rails I have found on the internet have reviewers saying they don't fit a cotbed. Does anyone know of one that does?
Thanks.

I bought a set of "Dream Tubes" for DD who has just moved from Cot into Cotbed. It is a 100% cotton fitted sheet with two zipped compartments into which you put an inflatable tube. They are fantastic!! Her bed is against the wall so I only need one tube in. I was so impressed I bought a single bed sheet and we used this last week in Devon and she slept in a normal size single. Will also be able to use this at my parents house and when we go to Portugal in the Summer. I can't recommend them enough!! PS - they also keep the duvet in place!