Headmaster Collar. Child 3″. Provides excellent support and control. Open design is cool and unobtrusive to wear. Bend manually for custom fit. Soft rear strap with hook-and-loop closure. Neck pad attaches to the inside rear of the neck strap for extension support. Place the pads lateral to the occiput. Bend to a comfortable fit. Neck pad is totally cloth-covered. Sizing: Measure center of chin to corner of jaw. UOM: 1/EA.