You will see units listed as 300g or 400g, and the number matters more than most buyers realise. It is the total weight of hair in the unit, and it decides how full the finished look will be.

Weight and fullness

More weight means more hair, so more density from root to tip. A shorter length such as a 12 to 16 inch bob can look full at 300g, while long lengths of 26 inches and above usually need 350g to 400g to avoid thin, see-through ends.

Weight and texture

Curly and body wave textures naturally take up space and look bigger, so they can feel fuller at a lower weight than bone straight hair of the same length.

A simple rule of thumb

  • Short and medium lengths: 300g is often enough for a neat, natural look.
  • Long lengths: go for 350g to 400g for volume that lasts to the ends.
  • Dramatic volume: choose the higher weight whatever the length.

Every product page on Hair Crib lists length, weight and lace type, so you can compare units like for like before you buy.