What had been a flat circular … The full Owlet Smart Sock 2 package costs $299.99. Pros. The newest design (Smart Sock 3) promises a better fit for the baby’s foot and improved accuracy; Peace of mind knowing that alarms will notify you … You chose between Mint, Blue, and Pink for the sock color. Let’s start with the sensor (one of the thoughtful bits). Our newest Sock … Parents around the world trust Owlet every night to help them keep their babies safe while they sleep. Owlet also offers a payment plan with Affirm, so you can slowly pay off the device with payments as low as $25 per month. Quick, wireless charging delivers a fully charged Smart Sock … Amber Bouman/Engadget. Additionally, Owlet … Smart Sock 3 has been completely redesigned to accommodate more babies, from 5 to 30 pounds, and continues to track Baby’s heart rate and oxygen through gentle motion. The sensors included with the Owlet Smart Sock 2 (left) and 3 (right). Our award-winning Smart Sock goes beyond the capabilities of any other baby monitor to monitor the things that really matter, when it matters most. Owlet Smart Sock 3 DUO Pros/Cons.