【2-in-1 Universal Design】-- Our 2-in-1 seatbelt features a lockable, tangle-free carabiner, ensuring universal compatibility with most vehicles. It can be securely hooked to the latch bar or headrest rod when the traditional safety belt is incompatible with the car buckle socket. 【Safety & Secure】-- (1) Breathable Mesh Chest Vest Harness: Our harness wraps around your pet's body and neck, providing a secure fit that prevents them from roaming in the car or jumping into the front seat. It serves as a great alternative to a collar. (2) Elastic Safety Dog Seatbelt: Made from durable nylon strap with elastic flexibility, this adjustable leash is long enough to allow your pet to move around in the back seat and lie down comfortably. 【Breathable & Comfortable】-- Designed with double-layer breathable mesh fabric and padded edges, our dog seat belt harness provides exceptional comfort for your beloved pet. The wide chest area helps distribute pressure and prevents choking. 【Adjustable & Easy to Use】-- The harness is easy to put on with two buckles on the chest section. Four adjustment points on the harness straps make it simple to achieve a comfortable fit for small, medium, and large dogs. The breathable mesh chest vest harness is adjustable to alleviate pressure and ensure a perfect fit. The seat belt is also adjustable and easy to connect in the car or trunk. 【Wide Application】-- Our harness can be used as a travel restraint in the car to prevent your pet from jumping out of the window while driving. It can also function as a regular everyday harness. How to choose the right size harness? 1.Please kindly measure your pet dog’s neck girth and chest girth before purchasing. 2.Please allow 0.5-1 inch error due to the manual measurement. 3.Here are the Harness Size Guide for your reference: XXX-Small --- Neck girth (8.6-10 inch),Chest girth (11-13 inch) XX-Small --- Neck girth (10-12 inch),Chest girth (13-17 inch) X-Small --- Neck girth (11-14 inch),Chest girth (16-18 inch) Small --- Neck girth (14-18 inch),Chest girth (17-21 inch) Medium --- Neck girth (17-25 inch),Chest girth ( 21-29 inch) Large --- Neck girth (21-31 inch),Chest girth ( 25-37 inch) Elastic Safety Seat Belt : 20.87 inch - 29.13 inch x 0.98 inch (L x W) Outstanding features of the Lukovee Dog Car Harness Plus Connector Strap: 1. Multiple design and shape is our innovative collocation to be great for your traveling with your puppy dog. 2. The material we adopted are the tough durable nylon fabric belt and the double mesh fabric vest harness strap, which can be a great protection for your dog. Why choose the Lukovee Dog Car Harness Plus Connector Strap? 1.The harness strap is designed to be universally compatible with most standard vehicles while securely keeping your pet in place for safety traveling. 2.This multi-functional harness belt not only can combine pleasure with treatment during the journey, also can be a collocation with the retractable dog leash. Package Include 1x Breathable Mesh Chest Vest Harness Strap 1x Elastic Safety Seat Belt Warm Tips: 1.Please measure your pet before your purchase. 2.Please take each measurement a bit loosely, so there will be room for your pet to move and breathe.