One size, adjustable. Thumb loop holds hand in ideal position.The ACE Brand Arm Sling lends a helping hand by keeping your arm in the optimal position. An adjustable, padded shoulder strap provides a comfortable, personalized fit, while a thumbhole loop holds your hand in place. Featuring a convenient buckle at the strap that’s easily manageable with one hand, the ACE Brand Arm Sling lets you comfortably go about your day to day on the road to 100%.The ACE Brand guarantees its products to be of the highest quality. If you are not completely satisfied with your ACE Brand product, you may return it within 30 days of purchase, with proof of purchase, for a refund or replacement unless it meets one of the situations below. We do this to protect all our customers and make sure that we handle every return or exchange with reasonable fairness. Products showing wear and tear Products with a missing label or label that has been defaced Products that have been soiled or contaminated, until they have been properly cleaned Products damaged by misuse, abuse, improper care or negligence, or accidents (including pet damage) Products lost or damaged due to fire, flood or natural disaster Past habitual abuse of our Return Policy