1) Generally the best size for ring is snugly and gives a little resistance when you take it off. Wider rings should be a little looser that narrow rings.
2) Some people take note that if you are not used to wearing a ring, the proper size will probably feel tight a first. That's why some people loose their wedding rings because they choose sizes that are too loose.
3) How to Measure? To choose the correct size for you, measure your body as follows
4) Once you know your body measurements,consult the Size Chart on the product pages for actual item measurements to determine which size you should purchase.