Width of these collars is 5/8" or slightly over one-half inch.

Sizing: Measure your dog's neck circumference and add a little bit for comfort.

Bows:
XXS = 6" - 8" x 5/8" wide-one bow
XS = 8" - 11" x 5/8" wide-one bow
S = 11" - 14" x 5/8" wide-two bows
M = 14" - 18" x 5/8" wide-two bows

Matching leash and barrettes sold separately. Click on links below for these coordinating products.