It velcros around the body, which feels nice & secure and then it clips to keep it closed without question. The clasp is sturdy.
This harness is amazing on my little 4lb yorkiepoo. My lil guy stryder loves these voyager harnesses. My 11lb havanese loves her harness.
The xl barely fits my smallest dog who is 19 lbs. This harness has several flaws. The main flaw is that it chokes my dog if she pulls even a little bit.
Just lay it flat under you dog, wrap it around the and then clip the straps up around the neck of the legs. My dog is a 17lb bichon.
The straps and buckles look like they would be super durable, but a lot of th seams and stitching only gets the very edge of the straps. Couldn't even test it or try on because the straps were broken.