The present disclosure is directed to a flexible, adjustable, collar. The collar includes a flexible member having a first end and a second end. A plurality of surface features, each having a raised portion on the upper surface the flexible member and a corresponding recessed portion on the lower surface of the flexible member, extend from the first end along the longitudinal axis of the flexible member. An attachment channel to accommodate the passage of the first end of the flexible member is disposed proximate the second end of the flexible member. An attachment feature having a physical geometry corresponding to the recessed portion of the surface feature is disposed on the bottom portion of the attachment channel. As the first end of the flexible member is passed through the attachment channel, the attachment feature engages the recessed portion of each of the surface features.