New in box Two toddler-sized socks, for left and right feet (30lbs. to 55lbs.) - DOES NOT INCLUDE THE SMART SOCK SENSOR The NEW toddler-sized fabric sock works with your existing Smart Sock Gen 3 sensor, and Owlet's optimized technology continues to provide peace of mind as your child grows, between 30lbs to 55lbs. -Track your toddlers sleep trends. -Access to 42 additional months of live readings. -Tailored monitoring technology as Child grows. -Large fabric sock works with Smart Sock 3 sensor.