I don't recommend either underjams or goodnites.
My nephew wets the bed and his mom tried both those brands of bed wetting underpants and they both leaked on him.
He was small enough to fit into pampers cruisers size 7 so that's what his mom bought for him and he wore those at night.
She told him that the pampers would be better and that he wasn't a baby just because he was wearing baby diapers.
They made him feel much better at night and in the morning waking up to a dry bed and dry clothes.