I was looking for a not bulky running/walking belt to hold my phone, keys, and dog treats while exercising. I was having an extremely hard time finding what I was looking for until I stumbled upon this product. Most of the other belts out there seemed to be designed for people with a relatively large waist. I was pleasantly surprised with this one. At it's largest it measures about 30" but has stretch to it to make it really comfortable for activities which is perfect for me since my waist is 30". This may be a problem for anyone with a larger waist. I have used this belt for multiple runs and it is wonderful, however I have yet to test and see how water resistant / waterproof it is. Regardless, I would 100% buy this product again and recommend it to anyone looking for a low profile running belt.