The 'standard recommendation' for nappy making is for 1x hook to 3x loop.

Here you can buy hook & loop separately so you choose how much you need of each rather than being lumbered with way too much hook!

If you're new to nappy-making don't forget to buy both, one is no good without the other ;)

38mm (1 1/2") wide.

Superbly strong grip, not easy for those inquisitive fingers to pry open! Nice and soft and flexible, easy to sew.