Product description: Material: Polyester fiber Suit for: Small Medium Dogs,Cats Size----------Chest-------------------Neck--------------Weight M---41-49cm/16.14-19.29"---30-38cm/11.81-14.96"---4.5-8kg XL---52-60cm/20.47-23.62"---43-52cm/16.93-20.47"---11-15.5kg Feature 1.ATTENTION - NOT directly correspond to your pet's breed or weight. Please MEASURE your pet’s chest (full part) girth and neck girth before purchase. Sizing does You can refer to Our Size Guide and sizing chart for the best fit. If in between sizes, please order one size up. for Small Medium breed up to 30 lbs Breathable Mesh Design, Soft and Comfortable, Suitable for All Seasons: Lining fabric soft, external mesh design, wear comfortable. Under the protection of force, the four seasons are suitable. The lining is breathable mesh, which ensures a soft dog harness without choking the dog's hair Lightweight Design: Overall lightweight, wear safe and more comfortable, the dog can move freely. In line with canine engineering design Strong and Durable Material: All hollow-out buckle, strong and durable, still strong in extreme cases. Hardware fittings do not rust, do not deform, do not leave fingerprints, and durable Burst also Do Not Choke Neck: Chest and abdomen padding can be balanced power, can be long-term wear Note: The size of the dog vest harness is small. If your dog size is in the middle of the size, please choose the larger size