Product Size:

Button style：

• XS: Suitable for neck circumference5.9-7.87in  Suitable for weight of about 2-3 pounds
• S:  Suitable for neck circumference7.87-9.84in  Suitable for weight of about 4-5 pounds
• M: Suitable for neck circumference9.84-11.81in  Suitable for weight of about 6-8 pounds
• L: Suitable for neck circumference11.81-13.77in  Suitable for weight of about 9-15 pounds

Strap style:

• XS: Main body5.9in,straps 4.72in each  Suitable for weight of about 2-3 pounds
• S: Main body7.87in,straps 7.08in each  Suitable for weight of about 4-6 pounds
• M: Main body9.84in,straps 7.08in each  Suitable for weight of about 7-12 pounds
• L: Main body11.81in,straps 7.08in each  Suitable for weight of about 13-20 pounds

*This data was obtained from manually measuring the product, it may be off by 1-2inches (2-3cm).