I'm 5ft 6" tall, waist varies from 34" on the narrow side to 38" when I've put on a few extra pounds (I ranged from 190 pounds in the beginning up to about 100 kg). now at 165). The medium size has worked great for my weight fluctuations. I've been wearing this belt almost every day for over 3 years and it holds up great. High quality leather, pleasant to the touch. as good as expensive belts, but better than anything you'll find at Walmart or other options in this price range. Does not come with a buckle so make sure you know this before purchasing this item. The description clearly states that the buckle is not included and I knew that, but I want to make sure it's clear in my review in case anyone didn't get it. I already have a couple of buckles that I love and my old belt broke after 3 years so this no buckle option worked great for me, this belt outlasted my last belt which cost twice as much as this one. Will definitely buy it again when it finally breaks. Great product, great material, great price.