So, what's the difference?
The answer is - one extra layer of fabric! Simple are that.
At Green Cheeks, all of our inserts and boosters are 55% hemp 45% organic cotton.
They are all 140mm x 350mm approximately.
The thickness for a 4 layer is marginally bigger, but as you'll see from my photographs attempting to measure them below, there really isn't much in it.
And they are so slim - 3mm and 4mm respectively.
Hemp is supplied as standard with all of our nappies - to buy your hemp without a nappy - click here!