Beautiful quality, the smallest size is still too small for my two month old so he wears it above is calf, under his knee. The first night he wore it he slept for 6 solid hours.. he normally wakes for a feed every 3 hours like clockwork! And when I ‘charged’ it by leaving in the sun for the day, he slept for 7.5 hours. He’s never slept longer than 5 hours at a time since he was born. Love love love!