Four Sizes Available -- Small for pets neck 11.8"-19" & chest 17.3"-23.6". Medium for pets neck 13"-19.6" & chest 20.4"-26.7". Large for pets neck 18"-23.6" & chest 22.8"-32". X-Large for pets neck 22.8"-34.6" & chest 31.8"-41.7". Please measure your pet and refer to our size chart before purchasing. It can help you get perfect fit dog harness for your pet girl/boy!.Comfort & Durability For All Seasons -- Made of wear-resistant premium Oxford fabric, the pet harness is soft, lightweight and suitable for long wearing. Its interior is specially designed with three layers of breathable mesh lining, allowing your pets to enjoy the fun of walking or running more freely. Ideal for pet daily training, hiking or going out..Easy to Put On & Take Off -- Step 1: Open the quick release buckles on both sides of pet vest to let your pet's head and front legs pass through the step-in pet vest. Step 2: Adjust and lock the four sliding strap buckles in place to ensure that your pet stays comfortable while walking and the dog vest will not loose or fall off easily..No Pull Puppy Harness -- The puppy vest has sturdy D-shaped ring on the front and back to facilitate its connection to the traction rope hook. The back buckle is for daily walking and the chest buckle is for correction so your pet can quickly learn to stop pulling. Its fixed design will not swing easily to better keep your dog comfortable walking and running while effectively preventing suffocation and strain..Super Reflective Trim -- Banana Print dog harness is a omnidirectional reflective design, which is more convenient for you to locate your dog at any time in the night walk or dark occasions, especially the dog with black fur. It is an ideal holiday gift for family, lovers, colleagues, neighbors and friends who have cute pets!