HELP YOUR BABY SLEEP LONGER - Our gently weighted Zen Sack mimics the pressure your baby feels when held by you. Helping babies to self soothe & sleep through the night when not in your arms. Parents report longer sleep in 1-3 nights. MADE FOR BABIES ALL SHAPES, SIZES & STAGES (AGES 0 TO 24 MONTHS) - Whether you are looking to transition from a swaddle or the developmental changes are causing regressions, put these sleep disruptions to bed with the Zen Sack PRODUCT INFO - The Zen Sack Classic is made from 100% Cotton and has a TOG rating of 0.5 which makes it perfect for year-round comfort. To learn more about weight distribution, sizes, care instructions please check the product images IMPORTANT FEATURES - Safe for all sleep types (back/side/tummy sleepers). 2-way zipper system allows easy diaper changes. A wearable blanket with adjustable shoulder snaps grows with the baby. SATISFACTION GUARANTEE - If at any point in time - for whatever reason - you should be dissatisfied with the Zen Sack - don’t hesitate to contact us. We offer customized tips to help you!