Arm position with button, can fixed the sleeve when rolling up. Spare button sewn on the inside. Using Onepolar button,more durable. About 3M Scotchgard: Scotchgard keeps your clothes free of stains. Over 55 years ago, 3M made an important discovery that captured America"s attention: Scotchgard Protector. In a time of short-lived fads, consumers were ready for a long-term solution to help keep their fabrics looking good longer. The revolutionary stain repellent was instantly embraced and is now one of the most well known and trusted brands in stain removal and fabric protection. About Onepolar: As a company established in 1994, Onepolar has become a well-known professional outdoor sports gear brand and the sole gear provider of the mountaineering team in the past decade. Onepolar strives to surpass the boundaries of innovation by keeping abreast of the latest technology and using the finest materials. Our aim is to create the best possible professional exploration apparel, footwear, backpacks, equipment and accessories designed for enthusiasts who love the thrill of adventure.