Thank you for your interest in this custom gear for the Chicago Area Tandem Society. All items in this store are considered custom, and fall under our return policy for custom gear. The only returns allowed on custom gear are for manufaturer defects, or if we shipped you something different from what you orderd. Exchanges/refunds due to sizing issues will not be accepted. We recommend if you are not used to cycling apparel that you order one size larger than you normally wear. All items contain a link to our sizing guide.