A few years ago, Aimpoint introduced a smaller, lightweight version of their proven red dot sighting system. Called the T-1, it was designed to be just as durable and reliable as its bigger brothers, with just as impressive battery life to boot. The only thing missing was some bump protection. Former 10-8 Forum Member Joe Chen had the brilliant idea to develop a cover similar to the Aimpoint Factory Rubber Cover for the Comp M series sights. Originally a Kickstarter project, it grew legs and the bright minds at TangoDown were charged with production. Today, the iOCover is cheap insurance to protect your already tough T-1 from bumps and bruises.
SOURCE: http://www.tangodown.com