Plantar Fasciitis Night Splint Maintain proper plantar fascia alignment while you sleep with this adjustable night splint, designed to hold your foot in a gentle 85°–90° dorsiflexion position. This controlled stretch helps prevent the fascia from tightening overnight—one of the primary causes of sharp heel pain with your first steps in the morning. By keeping the plantar fascia and Achilles tendon in an elongated, recovery-ready state, the splint supports healing, reduces morning stiffness, and accelerates long-term relief from plantar fasciitis.