HALO Ultra Soft Cotton Muslin Sleep Sack

Last updated: January 10, 2024


The zipper on this muslin sleep sack opens from the bottom for easy diaper changes. The sack is sleeveless and lightweight to provide proper airflow and prevent baby from overheating. Parents will find this option comes in a large, which is ideal for babies who weigh between 22 and 28 pounds.

We looked at the top Sleep Sacks and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Sleep Sack you should buy.

Product Details

Key Takeaway: Stitched into the fabric of this muslin sleep sack is the words "back is best" to remind parents to lay baby on his or her back to sleep safely.

In our analysis of 44 expert reviews, the HALO Ultra Soft Cotton Muslin Sleep Sack placed 12th when we looked at the top 17 products in the category. For the full ranking, see below.

From The Manufacturer

Halo SleepSack Wearable Blankets are the #1 trusted choice of hospitals and are used to help babies sleep safely from the start. In addition to sleeping safer, it helps babies sleep better, too. It’s a warm cuddly blanket they can’t kick off; ensuring baby sleeps soundly throughout the night, with a unique, roomy sack design recognized by the International Hip Dysplasia Institute as “hip healthy.” Inverted zipper opens from the bottom for easy diaper changes; sleeveless to reduce the risk of overheating; arm and neck openings sized for a safer fit. Made with two layers of lightweight and ultra-soft 100% cotton muslin with a TOG rating of 0.5, this Sleepsack offers just the right comfort for warmer seasons or climates, and can be layered with warmer sleepwear for cooler temperatures. Cotton muslin is exceptionally breathable for optimal airflow, reducing your baby’s risk of overheating and ensuring comfortable sleep. Size X-Large is designed for babies weighing between 26 and 36 pounds who are generally 18-24 months old and 35-40 inches long.

Our Expert Consultant

Kate Desmond 
Parenting Pro and Safe-Sleep Expert

Kate Desmond is a writer and infant safe-sleep expert. She has spent the last eight years working as the marketing director for Charlie’s Kids Foundation, a nonprofit that aims to educate families about SIDS and safe sleep. In that role, she travels around the country learning and educating caregivers and providers on the latest and greatest safe-sleep information to prevent infant death.

As mom to two elementary-aged daughters, she spends hours researching the best and safest products for her own kids. She is quick to get in the weeds with other mamas, and uses humor to cope with parenting woes from potty-training to teaching kids to read.

View our Sleep Sack buying guide for in-depth advice and recommendations.

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