a collar useful in animal care , which includes a closure connector and a flexible belt having a free end and distal therefrom a thickened knob . anchored within the connector &# 39 ; s frame , the knob is disposed contiguous with a narrow slot formed therein through which all of the belt , except the knob , is initially threaded . once looped back around the connector &# 39 ; s frame , the free end is pushed through the frame until it re - emerges there - from . with the collar adjusted to provide a snug fit , one can then activate a closure mechanism , in which the foot of an arm pivotally connected to the frame clamps a short portion of the belt , across its entire transverse width , against the frame . when the belt is so clamped , pulling on it increases forces pressing the foot against the belt . cast from a silicon rubber / phosphorescent additive mixture , the belt exhibits luminescent properties , making it visible in the dark .