The new Oura Ring 5 has arrived , and it packs a suite of enticing new features for fans of the smart ring form factor. The headline change here is that  the Oura Ring 5  is 40% smaller than its predecessor, giving it a design that looks much closer to a traditional ring. There are also new health features, including nighttime blood pressure and breathing trends. It’s the latest example of the increasing Apple Watch competition … Oura Ring 5 design and features The biggest change with the Oura Ring 5 is its design. It measures 6.09mm wide, down from 7.99mm on the Oura Ring 4 . It’s 2.28mm thick, down from 2.88mm. This is a dramatic reduction in overall size, addressing one of the biggest complaints of previous Oura Ring generations. In images, it now looks much closer to a traditional wedding band size.…