These pull-ups come with a 3 layer bamboo insert. They have a pocket at the back to stuff with what ever works best for you. They have 2 waist options to make them bigger and smaller and elasticated sides to make them easy to pull up and down. They have new stronger better elastic than the main picture you can see and it’s shown in a separate picture. They fit approx 40cm to 55/60cm waist depending on the shape of your child as they are all different 

My 7 and 8year olds are 55cm waist and they fit them

Canary Pull-up