The Ultra Rest HDX is our top of the line model. With its sleek design and extra versatility with the latest bows you will not be disappointed. The HDX holds all the features of the HD model. If you are the archer that demands nothing but the top of the line with al the bells and whistles, this is the model for you. Sleek curved capture bar for more versatility. Features Advanced Vibration Technology, Lock Down Technology and Velocity Drop Away Technology. The mounting block design is more compatible than ever before. The advanced vibration system forces peak vibration amplitude to a minimum while durable molded rubber creates a quiet comfortable field. You can quickly adjust the timing cord to the proper length even after it is clamped to the buss cable. The full draw indicator marks insure proper launcher position at full draw.