Metatarsal pads are commonly used on their own or as an addition to foot orthotics to treat a wide range of forefoot problems such as metatarsalgia and claw toes.
 

Resources:

Metatarsal pads

Placement of metatarsal domes

Metatarsal pads and metatarsalgia

Secret of met domes

Met domes

Met Domes: (Why) Do they work?