Cool cotton - strap under chin with velcro closure. As a guideline only:
XS - 15cm width suits Chihuahua
S - 16cm width suits small maltese, poms, cavs,
S/M - 17cm width suits malt/shitzui cross, snoodles, cavoodles,
M - 18cm width - cocker spaniel,
L - 20cm width suits staffies,
XL - 22cm width suits labs, boxers,
