Size: S: chest circumference: 23-28 cm, recommended weight: 1-3 kg. M: chest circumference: 28-33 cm, recommended weight: 3-4.5 kg. Size L: chest circumference: 33-38 cm, recommended weight: 4.5-7kg. Super comfortable and breathable material: the vest-style harness is made of lightweight and breathable mesh that does not overheat in hot weather and retains heat in winter. Excellent adaptability: adjustable straps with a sturdy buckle that supports a large load capacity to prevent your pet from breaking and you can easily adjust the harness to give your cat the perfect fit. It’s also virtually waterproof thanks to its secure jacket-like design. Safety and greater control: Our cat harness with a seam on the top can adapt to the cat’s neck and chest, and it also features a soft edge and elastic padding to prevent cats from hurting themselves when escaping. Thus, it offers much more comfort and security than an H-style harness. Easy to wear: This easy-to-wear harness is simple to put on