Tricot Foam Knee Immobilizer, 16", Size S - Constructed of tricot-lined foam Features one medial, one lateral and three posterior stays that are removable and malleable Contoured posterior stays fill in the area behind the knee 2-1/2" (6.4 cm) wide foam strips line the interior side of the medial and lateral stays to reduce migration Alternating 1-1/2" (3.8 cm)