You can send them back as long as you don't use them. They have an excellent return policy. As far as sizes, I would go up rather than down. I have a medium hand but wear a large in grenade and dakine

dustin - we have a unconditional 100% guarantee ... so if they don't fir our you decide you don't like them (even after wearing them) you can just call up out wonderful peeps down in customer service and they will help you with the return process!