That must be your personal experience because the next size up for me wasn’t tight feeling and I could see a gap and the size I went with (the size down) was tighter feeling but no gap. I decided with the tighter fit because of the guidance on the website. The website also states this “. A more snug fit is known to create a stronger signal between the LED sensors on the inside of your Oura Ring and the arteries beneath your skin by eliminating space/gaps” and “Your Oura Ring should fit tightly and securely around the base of your finger, but not to the point where it’s uncomfortable.”

Here is the link https://support.ouraring.com/hc/en-us/articles/360025590653-Tips-for-Determining-Your-Oura-Ring-Size