Underpads are reusable/washable pads which protect bed and skin from incontinence moisture  Underpads, while saving money on replacements , are also environmentally friendly.

Nappies, in stricter sense are another name for Diapers. However, Nappies are soft pads which are used in conjunction with Underwear. Nappy pads do not have the outer plastic wall that diapers have. Nappy pads need to be inserted in the nappy underwear and put on the baby, whereas diapers can be worn as such. Nappies could be reusable or disposable types.