The small was way to big. I had to give it to someone else. But other than that it was a really great collar. Okay.. had to update this review. This is the first time I have ever updated a review, or ever needed to. First I have to say, I am blown away with customer service on this. Shortly after writing the review someone contacted me and asked Me if I would like a new collar. Never ever in my online shopping experience has that ever happened. I should have contacted them first but I absolutely never do. For someone to reach out to me that cares so much is once in a lifetime. Okay.. customer service review.. The best I have ever seen, rated way beyond a 10. There are not enough stars in my opinion. Now product. The first collar I received was red. Super cute and it worked really well, really bright and I loved the fact that it was rechargeable, but it was so big it slipped right off his neck. I’m not sure if I ordered the wrong size or what, but the second collar they sent (remember, they reached out to me!) fits perfectly. It is really bright! I used to use the small clip on lights but with out a doubt I can see him from a ways away. I love the new green one I was sent, (they did send me pics and asked which one I preferred and I chose green.) it is a neon, very bright. My Charlie loves new collars and he was very excited with this one, so I am assuming it is comfortable for him. He tends to run off sometimes so now I can see him for sure! This company is great! Never had I have someone reach out to me. I am flabbergasted, I would recommend this company without hesitation. The product is wonderful and fits perfectly now, it is very bright and I can see him from a long way away, and customer service is the best I hav ever seen in my years of online shopping. Anyone will be perfectly satisfied with this collar, and if they are not.. reach out to them, let them fix your problem. I highly doubt anyone could ever be disappointed in this product or company. I know when I purchase something online, it might not be what I am looking for and that is the risk I take, I am okay with it. But this is not a risk at all and it really warms my heart someone reached out because they care. There are not enough words for me to show my appreciation, so I’m gonna end here. I am sure there will be no dissatisfied customers, and u can not go wrong with ordering this product.