Great
I wear rings size 6.5 rings, and after reading the Ridge website it recommended to size down for silicone. I agree with that after trying mine on. The size 6 8mm silicone ring fits perfectly, and even has a tiny bit of wiggle room (and stretch) to easily get over the knuckle. I have previously owned a few other silicone rings from other brands, and this one is my favorite in both style and comfort.
My only slight against the ring is that the "Alpine Blue" color in person is a very flat gray with the slightest hint of blue, unlike the pictures that make it look more aqua/turquoise.