This paper describes a study of the UPsuit, a proximal stability splint fabricated from Lycra, in the management of children with cerebral palsy. The splint improved posture and reduced involuntary movement immediately. The amount of functional improvement depended on the type and severity of impairments, the subject's attitude, their capacity for purposeful intent and compliance. Compromised lung function and pre-existing hypoactivity were medical contra-indications to UPsuit wear whilst a limited capacity for purposeful intent or a negative attitude restricted benefits. The Upsuit was of great value to one-quarter of subjects, but Lycra splinting may benefit a wider spectrum of persons with cerebral palsy in the form of less intrusive splints applied to the limbs.