Using a soft measuring tape, measure your wrist just below the wrist bone, then add about .25-.5" depending on how loose you want your bracelet to fit. If you don't have a soft measuring tape, you can use a string or strip of paper and then measure it against a ruler.

Check out this graphic to see roughly how different chain lengths sit on an average build.

Always ROLL stretch bracelets over your hand - DO NOT stretch them over your hand! Doing so is the FASTEST way to wear down the integrity of the elastic thread. Keep all of your bracelets and necklaces away from soap, perfume, skin & hair products, sunscreen & salt water. These things can wear away the finish, plating and colour on beads and chains (even gold & silver!) Gemstone beads should be cleaned periodically with a damp paper towel or soft cloth.