XS: collar; 38cm   long 1.2M，About 0.5 cm in thickness, Total length about 150cm 

S: collars; 40cm    long 1.2M，About 0.7 cm in thickness,Total length about 150cm 

M: collars; 53cm   long 1.2M，About 1.2 cm in thickness, Total length about 150cm 

L: collars; 56cm    long 1.2M，About 1.6 cm in thickness, Total length about 150cm