Size mearsured by ourselves, sometimes has some errors, but always within 3cm. If you're on the borderline between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. If you still don't know which one you wanna choose, please contact us, we are glad to help you! Orders are usually sent within 48 hours.If order hasn't shipped within 7 days from purchase, then it will be a preorder or wait for restock. Please allow 4-6 weeks for this process.