Nanit Breathing Wear™ works exclusively with the Nanit Plus nursery camera, to monitor your baby's breathing motion without putting sensors on your baby. The specific patterns on the fabric were custom-designed to be read by the HD Nanit camera, making it easy to check in on your little one, from your Nanit app. Band 100% cotton Breathing Band to comfortably track your baby's breathing motion No electronics or sensors in the product, on your baby, or in the crib Designed specifically to go around chest and abdomen Soft edge bindings - nothing sticks out for the baby to grab Elongated binding allows for variability in baby's chest circumference Secure, quiet-open hook and loop attachments for the perfect fit, as the baby grows Nanit pattern wraps around the entire Band - so breathing motion can be tracked even as your baby moves and rolls around Can be worn over most pyjamas Machine washable Size: Large (3-24 months / 13-30 lbs / 5.9-9.1 kg)