The Aircast Dorsal Night Splint is a great way to gain relief and rehabilitation from conditions such as plantar fasciitis whilst you sleep. The dorsal night splint works by keeping the foot locked in the dorsiflexed position (see photo). The level of dorsiflexion can be adjusted using the fully customisable hinge. The dorsal night splint is exceptionally comfortable with the help of the anatomically constructed foot pad and thermoformed layer on the interior. The fitting is based on shoe size and can fit either the left or right for greater convenience. Size Guide (Based on UK Shoe Size)