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zzZipMe Sleeping Sacks

zzZipMe Sacks replace loose blankets for a safer sleep. At SwaddleDesigns, we offer a full range of Sleeping Sacks in a selection of fabrics with different weights to keep your baby comfortable at any time of the year. Our sacks also feature a 2-way zipper which makes diaper changes easy.

The Chart below will help guide you to select the right fabric depending on the ambient temperature of the room in your environment. For example, if your winters are cold you would want to select one of our Cozy zzZipMe Sacks.

SwaddleDesigns Sleeping Sack Fabric TOG Rratings

When your baby if fully past the swaddle phase (Stage 1 - 0-3 months) and has completely transitioned or weaned from the swaddle (Stage 2 – 3-6 months), then baby is ready for Stage 3 in safe sleepwear (most often between 6-18 months of age).

3 stages of safe sleepwear pathway


This means baby is ready to sleep well in a loose-fitting wearable blanket or sleeping sack.  Our zzZipMe sacks come in a variety of styles and materials so you can always find the right option for your baby.

How to select the best sleeping sack for baby? Its best to use our chart above. Start by considering whether baby will be using the zzZipMe Sack in the Spring, Summer, Autumn or Winter, and consider the Sleeping Sack a wearable blanket. Just like you change the bedding on your adult bed according to the season, you will want to select the right fabric for baby’s zzZipMe Sack.

If you live in a warm climate all year long, you would most likely just need Cotton Muslin, and perhaps some Cotton Flannel or Cotton Knit for when the temps dip a bit.

But if you live in a climate with seasons, and it gets cold at night, consider one of the Cozy styles or Baby Velvet.

The TOG number mentioned on the chart represents a level of thermal resistance. The higher the number the warmer the sack. The TOG numbers are used as a general guide when dressing your baby for sleep. Every baby is a bit different, so it’s best to touch and feel your baby to ensure they are not too hot or too cold but comfortably warm, so they can sleep well.