The Oura Ring 4 hasn't been discounted until now and is currently seeing up to a $75 discount on select finishes during Amazon's Prime Day. This deal will likely only run during Prime Day savings.

The chemical is bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, also called BTMPS, which is in a group of chemicals called hindered amine light stabilizers. BTMPS is usually added to plastics, ...