Fasten snaps at ends to further secure after a knot is made. Measurements edge to edge 25" across (17"x17" bandana) *Handmade item ***There are many charts advising bandana size for suggested breeds and neck lengths. I have provided only one of many to help with your purchase. ***Please be sure to check these out to make the best, comfortable bandana length for your furry friend. *For reference, the last 2 photos are 50lb mutts with 18" necks comfortably wearing 29" across (20"x20" bandanas)*