MEASURE BEFORE PURCHASE: before choosing a size, please measure your dog's ribcage at the DEEPEST part; do NOT judge your dog's size from weight or other brands' standard; if your dog's measurement is between sizes, please choose the next size up SUPERIOR BUOYANCY: this dog life jacket is constructed with premium neoprene material and extra built-in flotation layers to enable strong buoyancy in the water without restricting your dog's movement COMFORT & DURABILITY: neoprene material makes this dog life vest more body conforming for maximum comfort and look less bulky than older styles; exquisite sewing process and thicken material ensure it for long time use STYLISH & ATTRACTIVE: bright colors and unique reflective elements not only make your dog look fashionable, but also enhance your dog's visibility in water, keeping your dog safe FASTENING SECURELY: fastening system around belly keep the flotation vest securely on your dog. Adjustable straps and quick-release buckles around belly and neck ensure perfect fit for your dog