Goodnites has a new FREE sample page for their Underwear Sleep Bedwetting Protection Diapers!
I have requested and received a sample from them in the past and they did accept my request today.
Also, it says ages 4 and up but I would look at the 2 size offerings of the diapers because our 3 year old is now sleeping without a diaper and we used them before she graduated from night diapers.
Of course, I imagine it is always good to keep them on hand for sleep overs and travelling. Our toddler who climbed in our bed coughing last night should have been wearing one as my husband came running out at 5 AM soak and wet from a rare accident :)!