The ASO® with Plastic Stays has the same great features as the original ASO® along with the addition of medial and lateral plastic stays to provide enhanced proprioceptive support. The removable plastic stays and padding have been upgraded to offer a lower profile and enhanced comfort. The ASO® with Plastic Stays is bilateral and fits either the left or right foot. Indications include: inversion or eversion ankle sprains and medial or lateral ankle instability.