The new Ultra-Rest HDX is QAD's top of the line model. It features a sleek new design and some upgrades from the HD rest. One of the first things you will notice is the new curved capture bar which helps to contain the arrow and prevents the arrow from falling off the rest at full draw. The vertical of the HDX has also been redesigned for more versatility. You'll notice some new markings on the rest to help with vertical alignment.